Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f81779bddcde8c6…

MALICIOUS

PDF

123.9 KB Created: 2021-07-24 20:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9707ccaeaed7069811e713e976f06b0 SHA-1: 7027039df16d2836b53444c3f44f7bac76116080 SHA-256: 5f81779bddcde8c6e3c8a29b176780726e39acc7c84d04ca0cc6490f5ca08f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe300b303c---67043161247.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53a4220b4---pevuronovuma.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864db5c1739---pavolamedapibafaviludu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076764375ee1---79541359292.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/nasikuvarofefolofosiv.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/40276988834.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/vewigasemegivodiporerub.pdfIn PDF document text
    • https://polytex.de/sites/default/files/bibetigijisiz.pdfIn PDF document text
    • http://mp-journal.com/media/file/53900899608.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074094ddda77---xaxaba.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l6l6soeu98ph6ckho5l1jrraph/datofunufe.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/bawabiwifukoxiwevas.pdfIn PDF document text
    • https://wsbtitan.com/images/file/sinopejuve.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609232bef41ff---18327711474.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/nedinurivakezaroji.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/12924034761.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/tebejasi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b9a51cc0aa8aec7e8bf9ab84339fc7b6/zoxiwerunarax.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b220afa312a---77536922517.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/m7tirtl3hee8of6hkpecd1l4dh/pulafenomoteligijoditaxor.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3dcbfdee---90745767109.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d30e78b56ee6573bdc16c2bfedbbf56a/fepofasurukokiwagojunuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frases+alice+no+pa%C3%ADs+das+maravilhas+chapeleiro+malucoPDF 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_off00017a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6B 20436 bytes
SHA-256: f84116be5044d6dd631a0fcbc3a540cfb3173b29be223773dea46ad9b11342e9
font_01_sfnt_off0001ad21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C538 10884 bytes
SHA-256: 39ce97d72cffb2f9df3b66a2eb71c26557c01038228fc421cf19c420e90b81a6

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