Malicious PDF — malware analysis report

Static analysis result for SHA-256 434212941ee32949…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 21:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0cdc4424b38107fe03296fe5455c921 SHA-1: 84959085c771161909cc18d0c4a90c68a11f6b34 SHA-256: 434212941ee3294999a505a2ae8b860ac07d079988054141d486da0bdd716066
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.sport-konyv.hu/userfiles/file/78930190864.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/35a9cae1d8b6e76a203ef2d83048cf6c/34116415938.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/femiwidedupoxov.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/fovixufupede.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f908c31a68---wivizikozo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/75d051032fad95dd4ec7704ca11c6a10/tovij.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074727ebe3b0---jazinewazixa.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/wunarakida.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/237f4c9078a96b82cda1aa523d2ce749/filope.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/texim.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c552d83720f---bilogivixeme.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//51810685343.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5385ab8beb67be20bb0de0ca03c99a21/37363010822.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/fupubenugeg.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/82806977532.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5d18ae14777152377ef3089466efb900/41033046193.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7512e858c---babujiwefilujomuja.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/enf7sgk5c9o4863tjtlv013t7p/lozipu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8mlvv6u4uf1hrgjs9funj5lao3/tasejoxivafaluxiresobu.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/37118225457.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fc7d248d---mokigojupitenikuwok.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0015f0eca82cd9f5c058fc6ea4f77e7c/7751465969.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2aa16f9a062f5f56ea1851abfc515cb4/fonupolagutefas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ley+ley+ponsPDF 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_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 9864 bytes
SHA-256: b76175725e95d33285efa21d4c7ea752921671fd0b10f457efb377b5861208b7
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000137e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E3 18620 bytes
SHA-256: 02580a8e898b2858c858d6eba3ce36a05f54346191deb92e31cbd781d044d2fa

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