Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fc7b556538f5bf…

MALICIOUS

PDF

110.0 KB Created: 2021-06-30 22:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5723a1f143b9b109ec99744fcd6a5a9 SHA-1: 3273e742af6b38c1e6cb044d048595d6344169a0 SHA-256: f9fc7b556538f5bfca4b17a1a7b9bea3603484e49cdf82a850707b09cae6e5ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and points to compromised WordPress upload storage, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=meaning+of+molarity+in+chemistry PDF link annotation
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pap2upfpbg3kj9i2g486b0ooh3/mitifagofo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ohkk8gtmicgnelgc1kudrv5om3/16559615392.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/77541623547.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a682d9e6f---lilaginev.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/34352979090.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/runojepinuforesokujufob.pdfIn PDF document text
    • https://vieclamit24h.net/upload/files/dogozasiwuvugarikazim.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37b0871a---gapoferufiguzo.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/33877345919.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4d8ecghhqttiv6udh9d0eh5tjk/50145063874.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3371eef2d30105956fa308194433e5b1/68134549849.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766e9aaca1---ruvupakobefopote.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967911e4d96---megiviboguges.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/73500412589.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ifc3dr95hfi8u98d0pk7d3vl9q/zelalinuwulebotidowode.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b48ee23437c1dd39f49b281a24e7d4c9/53323390138.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b42c8f10409dd656ac48ce226fad7702/jawagumed.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kedejogakawi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/egf0vgn1icsgmekifbln85ib0f/tudejegibesijom.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609604ca330b1---pazagawonogubekibikelidit.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca410fcbe---44878259058.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/q5d15gmb3uk7ouaba0jgcfk5lu/limamebemomirowutapus.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fupij.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bb8b13194fa077451d96b0c005bef042/bapol.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf7b5b6e1---87411342107.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 19100 bytes
SHA-256: 8fd6da9a88c1472d3d97f47089e564505c0686cd5c83e0931025fcafe45cb898
font_01_sfnt_off000163bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BC 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000178f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19108 10892 bytes
SHA-256: cb504ce629817a5569d86229637981a5719ff3aa9cea11ffeaefbb8cd064a908