Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d327a3025fee8…

MALICIOUS

PDF

125.6 KB Created: 2021-07-19 22:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2a3b51e36ebfb202118aeaf2fbb064d SHA-1: 56a20f2ba8aa092a1fb40fa55e511a0c6ee57ae8 SHA-256: a90d327a3025fee8a903b028a2cdf56dbad11cff101a5e10fdb52ad3b0c4a484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The document body is unreadable, but the presence of numerous links to potentially compromised sites strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609102c8ea058---xavekikuteweka.pdf In PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/43120462669.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8130b2808---rexikisu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1620e1c5---buxugejovuxotegerosagaw.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706683d38e0---49595494907.pdfIn PDF document text
    • http://cabini.it/userfiles/files/40664602259.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/88332304081.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a05e51caa4443f0efdd02f5d17c96c75/13952803089.pdfIn PDF document text
    • http://ashioke.com/images/library/File/65158687308.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ad3833e07---fidumitigutopixeta.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/pojagisabibifati.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/nepuwaputigiwuji.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_AD75B6C555DE428B.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7d21a98392b79ba60743a38f41a6193b/memixaxemop.pdfIn PDF document text
    • https://andana.us/files/files/99940431365.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210716221302.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aced77b328d08cc0978ce5d5876e8f98/70863031904.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867d64d1ea---pokezapowowajake.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41ecdbed6---42351655841.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1c30b9cf---juzitopuwugev.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/jk65c5k1lfvvih0068fbp7ac71/xuletosutopibufovov.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/meftfoopeims61do142o51veii/22514635233.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5c4cbe6b758d58c6f5c9caeef1cf880d/tevakugatel.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5dme2l9r09smt9gl0bs818t0f6/jikadawezixu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2adggg0u8n40o1p7cdc1kb8crm/bibivunuzodegojaxozut.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ebcc5190---kanifuronugogotuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=middle+phalanx+footPDF 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_off00017bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000193ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CA 10420 bytes
SHA-256: 267dcbddaaf2fb1275210df0e7676a2c21e2b20f44e4b325af211c264d879f3e
font_02_sfnt_off0001ab46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB46 26804 bytes
SHA-256: cb9399ca1416a8436fc0cb3f829d98f69107e12885a0d9d7b590b6d3efe252c9