Malicious PDF — malware analysis report

Static analysis result for SHA-256 4221a6957344beee…

MALICIOUS

PDF

108.9 KB Created: 2021-08-14 19:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4c871792f2840ffc39ea8a69c4d75cc SHA-1: 5c88043d34280b2acaeda0ab4226c19d5c361bca SHA-256: 4221a6957344beeeaaa877773839d8b144ec91fcddd96aebf06e2cbb4a0af259
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and extensive URL list clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=popular+names+for+female+black+cats PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/kcvb3vkej83smpisf14mdrue36/taduperixanamatosujufufor.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0a838fdd744117e2f5148e9b5dc016a7/wusezewulilazux.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b27690564c2---25906263275.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ce8570df98cee23c298655d739a3b2ce/31942646171.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k1pm76innpr96vh3g4871ep2ls/matut.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/58c4d7586e296b920de3c7e78a6538fb/68322800935.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/73184921095.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a013fccfbc1---88651145082.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075714e1066f---25372679728.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7381a3bab9109b670c5ff20fa62b12b/91316806487.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/votezameruwoloxubase.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9e50fe37---3152556559.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/xokopalavot.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/99006801197.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/83294057995.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hjqrg96sfcnshein7mlhuko7u5/93274811087.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kixupidekakonapi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13b1d953---59976437334.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/vemafavomim.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1af20fc84---18096796091.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gs3p97bp1cgu2bcr6i3cviit15/givulufusexafigoxijobuxo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ff9a30420feac6c64494676db602f570/murujemofimexofova.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nawadejenusebe.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210809_00C5B469A0B7A234.pdfIn PDF document text
    • 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_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 10884 bytes
SHA-256: b33a3b2877438e9496bd4dfae02277c19fd08468deb47af124bb7919a500b29c
font_02_sfnt_off00017590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17590 18116 bytes
SHA-256: 0ea97f8ff9e5515fba6e62d69178aa198a54606d8f5a7b57095e1e43127f1a32

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