Malicious PDF — malware analysis report

Static analysis result for SHA-256 179cba876199b5d1…

MALICIOUS

PDF

98.6 KB Created: 2021-08-25 14:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49b920eb7f126148e79e245bb6e771fc SHA-1: abad21d51c2ac0f66dacf5015729018f83906101 SHA-256: 179cba876199b5d18514fa548e9d738c7295ebab4376710c9988fea7cb588c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 https://guineaservicesproviders.com/gsp/files/34218344142.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0bc2735de47beb0be21483ec20a015d/34833312535.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de432edf47---biderufisigadiloxam.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/kajikafapolufizuwe.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/nurofutixumabamexoji.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/b8f9613aee8bd17fc2f6c2a895fac6e3.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/janagine.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vazapitifojenenetuvan.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc0f7ee4d---18649452837.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/35988137080.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/diwaxoxekeruvel.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/45768259498.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a879797a0b3b97962def938fdd78b7fa/lixekewipe.pdfIn PDF document text
    • http://boldogelet.hu/media/3895401444.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd0799e80---zudefexexalefivuka.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/80979d5cdab2ad0a67d481be02cc8f17/gajev.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a836d3a44976b4d5880a6175a69fdde6/rurilag.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172b89b9d52---67988317703.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/siwezagorikotafozewitav.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f6770027---90689809810.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/pojevuledizakufewude.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rkjbne1n7of79v6dhttc9heu8ersfq78/xerezut.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xovatemobiwasojujobor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wgt+golf+credits+generator+for+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 4120 bytes
SHA-256: 52b1b69ad1beee119b6699c4036b602b1540886aed9fc9aeeef03cb6ffa4410f
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 10788 bytes
SHA-256: 7df4ee8f5962d5425765b086a015d11325235318d3958e51348418f7c8a39c5a
font_02_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 18456 bytes
SHA-256: ebab11552caecdb94b50eb5a3da82cf5aada19ca4f91b0c40748b961ac215aa5
font_03_sfnt_off00016114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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