Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be2b187bff9bf3…

MALICIOUS

PDF

92.1 KB Created: 2021-07-04 21:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 584076a7d3a1282fb372b4a37b0a2741 SHA-1: 810e7d812e95281af7fe389e376eac8e34fe405e SHA-256: f8be2b187bff9bf3896a7b1f0f6c285157c3d7428332111ee4f29c84ba687b61
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous URLs, many pointing to WordPress plugin upload directories, suggests an attempt to distribute further malicious content or phish for credentials.

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9d357927---lirukojamo.pdf In PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/60132449296.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/pajivav.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf388d186---5233241736.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8p3merkspmo54maokm9mtm1hd4/92068809575.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/24797941752.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/gadavutelizugezajub.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nsc4cqtsb7aim4fdh03hn37llv/75266478131.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0b2a145f---44458538760.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/varebaje.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081027f1bb3f---jazazarifo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8d3c414e29fb4ab29829039fe2560ac3/14676442518.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/62406374869.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7340385504---2122447522.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b516902---35306658176.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xonurafoto.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/10683676338.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pukajixuradaf.pdfIn PDF document text
    • http://prograsifkalip.com/files/69088212662.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wimizamakunobonaje.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beb38dd0857---zekimunefagemiveralof.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/p829rfj353n9j3hcmhr03qkao2/dekupusemorotilesezululo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0018f8b9fbfc3a9a12c80f2f52586bf9/86865980360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=demon+slayer+mugen+train+full+movie+free+download+eng+subPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 11204 bytes
SHA-256: 2e4ad5d8137eadf24072b5591bd9863aa0efed31063584b6c2d86db39bf78dbc
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 16792 bytes
SHA-256: 4cb473a1ed9226fd7571328bf2abebdf53644b435aa84deade040455109147c3
font_03_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 17952 bytes
SHA-256: dd93361d6dbf451a9ac02d3166bfd45dd7c1f124eb43f340e58dfee8a2f874c8

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