Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5ff32df090c034…

MALICIOUS

PDF

116.0 KB Created: 2021-06-19 19:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5645afc2b835b4599a771f2538fe64e9 SHA-1: 2637be9ce3684690e1ebb55eb9af57aa000a99b7 SHA-256: 0c5ff32df090c034ddc62b20c85d176afc533823122651799fcef0df66aee32c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure, possibly related to a poem, to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9lkhmbie1hsn394d8k2lm0v3r9/rajagimedopafimizus.pdf In PDF document text
    • http://emannsltd.com/userfiles/losikatigalikup.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/91420505863.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v169ghk4r3rrs4n5km772pkn76/fepijutukesu.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/68988314934.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jususawozezenenojigulen.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7a0730f35d5976d0644364992d8056b9/siwivijekariruzujupudin.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nmi2jnaspd8ifi32o4ghnph4u7/suraguzes.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/054b496c3a2f5521a5443788b4e32259/tomabidawefuluv.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a0d7669da03a22cf0845770435ac4f2f/vobubedepitozisarize.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/fazurike.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/63626125832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cuerpo+de+mujer+poemaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18996 4876 bytes
SHA-256: 4c6ac2cb8e8ad8a6e8d50508a02ab44e4c2863039d76fad8c35f575aab54865c
font_01_sfnt_off00019a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A0F 12388 bytes
SHA-256: 75cf66c67a08ca8ae7646914016d9e2a944392285220336a91be38a3fe333967

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