PDF malware analysis — malicious · 3c93650a7908aaf4

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 22:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: d0a561c85288f14132a2e5e6930e7c8b SHA-1: 2a747fb871b04c9d6b585ce926cbe0457b054bf0 SHA-256: 3c93650a7908aaf4cd342a1d51a4b30f6ec40719391b8c768be19a7c4a4bf66e

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate the PDF is a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the overall malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/50drs9us04ucope0onvc688vn1/gunukadevumope.pdf In PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c996f14f7---58457286992.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5c98ae41d7cb6fdccfc8d8d6ce57b101/sejonuwukorap.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae311a742---53619463072.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9c9e61f88c787c64e88eaa349993ab2a/nawawopaliwotabaxir.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8d1156cd---55422259235.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/poieubltapb23jvelv1m7insfs/gedakejejod.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7cdaf493d8614a7d66dde44e8a8582f3/tomijaj.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d27af22b909a59afdca5d875fc2747d4/niponaxebakogo.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3e9795b7---lunugijibaso.pdfIn PDF document text
- http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6c3f17d5---3166906134.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4719ed362---melakosabenefofewu.pdfIn PDF document text
- http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b86bdc7fc---vufixivoxizurol.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa871ab5243---jizemojiwujamiveda.pdfIn PDF document text
- http://pro-group.ru/userfiles/files/98320011242.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4cc4db6ca047aee84e35d5462435ae98/52301484376.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a9a6dcd2---lajawivoraromo.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c182cbfb0---wekenirabodenodavazoxe.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a31ee73174a060f26aed61d881566393/68020658495.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/36bffd6d7e792aca1fe5c4793f5d4daa/xiradodiwonu.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/70454147864.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8332a78cad---27467400736.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e359efd15936a7721128f7f79be8abf2/31499698946.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=red+captions+for+instagramPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ede7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105F8	17648 bytes
SHA-256: `289c320292b78c4a1a79f11c2c96726e5402c28f74b4a3d7b5cb4a6cd19220a0`
`font_02_sfnt_off000120dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120DD	16636 bytes
SHA-256: `75b86c8912d13589cdf1dc2e6ef4326e08fc061e96ad03d0c16a3281bcf815bd`
`font_03_sfnt_off00014b4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B4F	10960 bytes
SHA-256: `7da21e705e90e1f3014ac29b55657f3ab6c9cae92db547bb80239cae080fb501`

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