Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d56ae3dc503045b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 15:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4b8a8a07a77e7d153eeb38d176c9fda SHA-1: 67c33a3311c499c3612b33087f980ad31597aafa SHA-256: 8d56ae3dc503045baa9ac6ce045aef8e35b2dce98f8c2ace5a0a67d9474122b4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'free robux survey' URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to deceive users into visiting malicious sites. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=free+robux+survey+2020 PDF link annotation
    • http://mawratanews.com/armedia/uploads/files/23950677884.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7e3fbeffa1f7c999981b983a4693a038/xuvobemaniraz.pdfIn PDF document text
    • http://cichanski.com/Upload/file/72368310410.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403300013de---jararitasolufoxam.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/361871901613f33e4f22a7.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/giwoguvi.pdfIn PDF document text
    • http://kd-council.com/upfile/files/ponapiriridukerikodomapes.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/84841838483.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/juvusetif.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/61097897637.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa6577ac8---sixazaxepofoti.pdfIn PDF document text
    • http://ombs.ru/uploads/files/10183396978.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/kevozag.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55993132387.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/73498718399.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/rotezutigezenap.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/73543993729.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/xulabufamusijuval.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/fidafudegumebobidaso.pdfIn PDF document text
    • https://akconta.com/uploads/files/kogadar.pdfIn PDF document text
    • http://billsky.ee/files/file/60046006396.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/waxojajosiwovojirojagom.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 17120 bytes
SHA-256: aead5143846d6bc597281f2e25c73d21442b2b4fa2b65ce61c8c1e776c68c79b
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 10340 bytes
SHA-256: b58e5e6120618e1efb7c6ed867e1657da081c54fe098df206ef4fdac0d30b7da

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