PDF malware analysis — malicious · fc0ae99a734b725b

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 21:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a3946a5284815eec5a6eb8b8be2b026a SHA-1: 97d946d8ffeb2d80a3150e206d4cf8f44b5c3666 SHA-256: fc0ae99a734b725b85a08e7faf3828331065b9c6e6d373179deb2f8a4f9b25e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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 http://budka39.ru/files/38943282863.pdf In PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9ca18e357---dujofuzolomemefulorilu.pdfIn PDF document text
- http://megalaserasia.com/upload///5942907479.pdfIn PDF document text
- https://sindonis.com/userfiles/file/wagatufili.pdfIn PDF document text
- https://073741256.com/uploads/files/202108262103034935.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/12844365247.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/687ee337b8d4cc643b3c026f4f5fde02/95631964528.pdfIn PDF document text
- http://monkey-do.net/userfiles/file/zowabekapugufibubof.pdfIn PDF document text
- http://banner-ever.com/ckImg/files/lowujebefamokisota.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/85425230890.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2932b0b99bd48f6385a624f2c744aee9/kifawuba.pdfIn PDF document text
- https://medtek.vn/storage/file/jajulukamapifoz.pdfIn PDF document text
- https://safe-international.com/userfiles/file/jitaxevekikijofanijufuli.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-5/file/delomifilevutotonin.pdfIn PDF document text
- https://faceless.me/userfiles/files/ruzorunedogoxutiwadimew.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r3755nvkoh802dtqjnojldntcq/sowalikanuzuzajo.pdfIn PDF document text
- http://solarexperten.ch/fckeditor/editor/images/file/rameviradevosusutugid.pdfIn PDF document text
- http://veganogle.es/uploads/ckfinder/files/ralulumaxogumawu.pdfIn PDF document text
- http://nuestratierrapremios.com/campannas/file/38536101046.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d140641c---70141048889.pdfIn PDF document text
- https://alohasafaris.com/files/duruvapedofevakitow.pdfIn PDF document text
- http://wingmanplanningdemo.com/userfiles/files/5624622077.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e981818812c62eb289082fba08a8dc8a/76465908231.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/baxipud.pdfIn PDF document text
- http://fantalife.nl/userfiles/file/jisazibu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sanatana+dharma+pdf+in+kannadaPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c6f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF0B	22400 bytes
SHA-256: `2750f51ee61e1b36d05c85b37a0095a5adb5bccb37060f79db3c08046eedb598`
`font_02_sfnt_off0001182e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1182E	10464 bytes
SHA-256: `2b4c1d16de3b970164eb243235bb64832cd6d88305501110cb360980787e90fd`

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