Malicious PDF — malware analysis report

Static analysis result for SHA-256 76167ed5a40efd1c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 13:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 078c3ddb5ad3dcb1b9b96c20375a04d7 SHA-1: a9b4b78793e08581cc100d4e82641f999e9e9dfe SHA-256: 76167ed5a40efd1cc06611fe6c228d6f79bbd48288c3823e846784061af6aef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crysiq.ru/uplcv?utm_term=casein+present+in+different+samples+of+milk+project+pdf PDF link annotation
    • http://agro-vostok.ru/userfiles/file/kegolukoxu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/50159979367.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f06e916---18784966488.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/a4d8n7q529s0kb2krf4hcohf39/9270939421.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/99762097141.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dodegalamuperaluwodegozun.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/63210113421.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dcaecd06dfd3185156089cde60f7ef65/61714942228.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/scuvb1e6lkhepp6n31metubd1m/71255220315.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/35qbed213avrsknbtacboth6oc/vovizidux.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/73774671063.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/90692623969.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/83621140135.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d7cb3729---37501315833.pdfIn PDF document text
    • http://garderoba.sk/images/_file/misubovitonilo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1fdae274---19675198787.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dufonixujuvuletonenixote.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fn48s6iccmi40aqa4ilaqeil42/rufexolaluzezusetixadoje.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83261164465.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/99203728582.pdfIn PDF document text
    • http://flexa.cz/docs/file/xufimekasexigoxate.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609be16edba20---49005343201.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/zisopugaxa.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/96772535229.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/6396128489.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0hbiafkm4kvkmhtao0e0gfqjqu/xigikenofa.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/xabovijuwanej.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.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 11032 bytes
SHA-256: 574a56cd4730c87e740f0c21d12e9c5924c8a5efd6a67ded481c9e1e02210bd4
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 19048 bytes
SHA-256: d2d4f30844bade984710e3672b4df39195b3c9963337501d3b5bfafc0a124930
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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