Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cf1d35c1cecf97…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 05:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 12afd4a688719de2e1b108335e0d1186 SHA-1: 4dd5538afaeaabc8861e7bc5d6c6e09ad5997134 SHA-256: e2cf1d35c1cecf975e7eb5de0f711cfaf1371a56cc44c9fde51490824f83cdff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=upstream+b1%2B+student%27s+book+pdf PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d8228937de287157df01ed18044fb780/ribaremubos.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/jejomazowerag.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hiqoe62q7udimejkjp6rn1ihsn/24971780539.pdfIn PDF document text
    • http://sayarbobinaj.com/file/vipiluwadivizogigofeju.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/dofumumuxiligexutejo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hgtkodg99aedpcam87pd3e9452/46805039763.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tadonufuvuzovavazumirokuj.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/jevonobosijigitiwigeluku.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/bumobidulumotumiwunowefak.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/55286813889.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/tevesejokal.pdfIn PDF document text
    • http://yuhongzg.com/d/files/65396744711.pdfIn PDF document text
    • https://steammining.com/userfiles/file/18757806680.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/37318800031.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/90816561741.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/12715173737.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/915394880.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/14073524646.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/10748635421.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091123032073499.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec4233e6afd5d82ed16d266bed32fb4e/34641394058.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_off0000bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB01 10944 bytes
SHA-256: 51216fbf5b0b9f4eeb9e37a9a89becac02996a2a342d223f53fb24ddead1e29a
font_01_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 17340 bytes
SHA-256: 030731f42c411d8d8ddc3196266d72467efd8148bafcaae125181adc3c990bcc
font_02_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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