Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64de1b27eee84c5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22903528a6c9a06a7923292b41722fa7 SHA-1: ec3874fc7fa93c768012bb7f2388889dc41a37a4 SHA-256: e64de1b27eee84c5cf71376b6762ed1352e466d3389b469833b15cbc9980a484
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically-generated and compromised CMS upload URLs. The PDF structure and embedded links suggest it is designed to redirect users to external, potentially malicious, content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • 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://3rproject.eu/ckfinder/userfiles/files/51605020463.pdf In PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/9838495786.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84801506485.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/30288415250.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/larunisipobuwok.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507e62078f---fulojumudekawedeso.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/lepixetaxupekip.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002d03e798---58236291864.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/daxerobow.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lulusivovanilubilobapi.pdfIn PDF document text
    • https://kimansion.com/uploads/file/kimenewotonusag.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/78845663955.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/roriloveloju.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/76175822668.pdfIn PDF document text
    • http://agmapure.com/upload/files/94423695405.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4a07b41e692a2b5dba3072b4ccd53513/71720477694.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614209f35a51f---pajiwamesew.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/zogosegitidi.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jutofinelotepowabaso.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/96305781840.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/24883825658.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/28674689876.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/xaxubizakujaveveke.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0143317001631422314.pdfIn PDF document text
    • http://1careglobal.com/upload/files/kupolimatumixekogobuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bike+race+unlimitedPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 17688 bytes
SHA-256: 129e02663fe2838024af13ea1f54f8cc28714f4cb7217a6ca5ebebe81d18b501
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 10488 bytes
SHA-256: 3f47abe9fe88405825196c7932a8ef144b831f8eafbfad90d373930fb3c0d5a9
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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