Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a19ae926485e1b5…

MALICIOUS

PDF

117.0 KB Created: 2021-09-07 02:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f7fc0537e881abc073c0af3f2ab4188 SHA-1: 4d455fb4ad8f12b3ed69c9c34511ee7979ef605c SHA-256: 4a19ae926485e1b58fe23f15153ff3478451fe0e11b1578033fbd3df7392a8ad
156 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 appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO poisoning. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160753eece93a1---97352383792.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/vubapulezoweguzo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe664f37f---pevisubedodin.pdfIn PDF document text
    • http://rilta.net/userfiles/files/94040536774.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/fumaxewakar.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/10943603016.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6af3ecc8cd6536a890a40a888559d3aa/tagevowok.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610373d7691d6---jiwarodevabutifofivuweron.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/paxulekagolulujo.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xijoxef.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/58560634043.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0b079372a41a0887284f25fc0e8205a5/73995986461.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c9lou26lobk5q8vassjtvjishc/fenojegukobipot.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/t5sn8tfrdvcpn0kmed1sa9a1d6/lovixisakusofofi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af6a30a8cec---fujuj.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7edaccb0a13cb9b5a4522cdd99804b70/31640205253.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/2257449243.pdfIn PDF document text
    • http://zimmerei-possert.at/siwobizeki.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/patarepe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098207e5acb2---5370165610.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3979ca185---34731799633.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1fb4109fc---jotekomepu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160939bd4f3cd6---riwipenasinego.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bvo1jhrhcqg0u2p1tc2t3ed37s/lufenubutesujo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fepikugam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=indesit+iwsc+61051+manual+romanaPDF 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_off00015ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172FC 11144 bytes
SHA-256: 2e8b0051a5dcfe0aa7b3c36ea57374e103cd133d0bca6d4b0828d5e0fbe917d4
font_02_sfnt_off00018d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D20 22436 bytes
SHA-256: 6ea1b09aabd992afa5bff25ed447db5a1c8595a067f0eee8ed9086747666926e

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