PDF malware analysis — malicious · c3eda7e0592ca711

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 00:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3c51daa8325886121923e6b85818e694 SHA-1: 2be7eb32afffc8f4d08dd2b584a21387586edddf SHA-256: c3eda7e0592ca711e534bb06a4da4c1c166bc0519d93cd270b8f265c00ad3f1e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 https://queure.ru/uplcv?utm_term=leviathan+axe+in+fortnite PDF link annotation
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/41e51c1c46d249c9fe54fb3a58843203/48060751723.pdfIn PDF document text
- http://orgue-chantepie.info/FCKeditor/upload/file/57322607490.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/4de4f4575e30b6054b198cb36fd17c02/78834775506.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb9772fe35a9f20720680613339223ed/gezeredolemuw.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/70865356005.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a24732e691b---xelumulezaripoz.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b59481bf---91028931434.pdfIn PDF document text
- https://coolinterier.sk/upload/files/tipowuvidid.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/473332a713e210f1589ad4d94a3eebbf/25254132060.pdfIn PDF document text
- https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/dfb12ac2449c88efc1de4d1bb35467ad/59734195946.pdfIn PDF document text
- https://diphong.com/uploads/rizedovu.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076907bbb72d---mesokaruwazalofetawos.pdfIn PDF document text
- http://manilag.com/FileData/ckfinder/files/20210819_5CD1BD4BF4CD19D0.pdfIn PDF document text
- http://shouce-image.kuchuancdn.com/Public/resource/files/lobufikoluteredopu.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edfdc107c76---felaxibo.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106edce28e18---32527481903.pdfIn PDF document text
- https://rizecanreklam.com/images/file/zujib.pdfIn PDF document text
- http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58967099751.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5so74k0kfg5t1f0qn780bpfs2/1550086208.pdfIn PDF document text
- http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/metolebovarok.pdfIn PDF document text
- http://eraucheta.ru/uploads/file/wuminerafexekabowes.pdfIn PDF document text
- http://iltorg.ru/upload/file/58604389256.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17b9d157b---salowezajajowifodimupixo.pdfIn PDF document text
- https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/ff0b2d6fbf0b4645293dc233edee0969/lelozanubujomi.pdfIn PDF document text
- http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
- 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_off0000bdc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d5d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5D3	17644 bytes
SHA-256: `9296463786d2a8a44300917dc433587aac7b2b88537d8fbfbbf749a34231cbc9`
`font_02_sfnt_off00010469.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10469	10224 bytes
SHA-256: `c85229259ec5a2836c2a81c8e1c87c006cfaa5e03f96dd4d1e915238b425344f`

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