Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1f3b913e658443…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 21:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f7aa2a41558ec847f02ed290b250a927 SHA-1: 9cf8fb721586e7cac67d8e596e985cb93bb6ac31 SHA-256: 1b1f3b913e6584436a27b2395f3af9807d1b6dbdd93e296db602ef1bcb887053
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mariellatriolo.it/public/file/96100735108.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pn9imkclmdi6qdptgtbk26r235/53847007714.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/rezaravekikedukas.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ad322b5b---poruxadiwaxexakuf.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/75557224866.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16109bb30f3cb6---17053453196.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/87442257982.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99788971927.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/kulotuwijemoriritidanapes.pdfIn PDF document text
    • https://egca.fr/userfiles/file/kumofopijiwelizit.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c471ac9d7---pemag.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sadipudodifuwekixako.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/9420643605.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/xurobolemowupe.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608109e7dfc85---bavesenekateke.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5o43qio4h01l8ao20n052qqql6/49307686031.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b82401de1691820fc271f887827fb6f9/91833102888.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca8262179---7009832556.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a091e775834---10127724834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=why+does+neosporin+smell+like+maple+syrupPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10860 bytes
SHA-256: b4ce83cbe7c4115d3b89f78fdda5300050e81b7c8671b6722a0558d60dc9c63c
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 17048 bytes
SHA-256: 80bc6fb566f95508ae83b52d84be08f7129371f51cb35846d26edb31c2f525f2
font_02_sfnt_off000143e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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