Malicious PDF — malware analysis report

Static analysis result for SHA-256 a513ca30e0706f28…

MALICIOUS

PDF

80.3 KB Created: 2021-06-30 20:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 354fa2657f25b98edb2984175dfa0f45 SHA-1: 8d63a7b145b98ee3658d845a4b37ebaf66efe356 SHA-256: a513ca30e0706f2884755ef07426bb60b6f821998aa2e517edecf8cfbaad1331
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy/paste content into a command-line interface, a common tactic for executing malicious commands or downloading further stages. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=string+to+uppercase+php PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2aa58d03---barumuxawologa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/57439439008.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/wolibif.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/21813e50b981de0934e4332a4a754fdc/sotuzaxudew.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c6d05204---63501413519.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74530945402.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3a894fefc988eb65f2dc006a00dc2ac4/debisisuzewatigu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/us1du61ikg7f8pd7546q74ujlk/wopalajuzokizudobap.pdfIn PDF document text
    • http://erex.hu/upload/file/vojalodon.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m9ouqpbopv4jabn0b8a7afn9o5/katin.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6aa7e71bdbb48c777300f65fdaacfecb/65541072053.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f36d55b3d6b45da8dbc54b737e291b2/jusisaxelujegemisezate.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/gufidi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/56d724c512b73c215d5fc2c4245ad2f7/banegemew.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4cfc7ec4---66619232041.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160767e183d5d3---pekuxuvabuga.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e56adaff---95323196502.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd99850d15---35609551975.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160b511c4c---sojunilasadexorarusereki.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3832dab488---33821037251.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/44164928510.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86dd943a01---sibilasexajenubojoxaler.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05835348fa39cdfe3d8e2193d5710ff4/46479460549.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fde27509---sozasigunozirefol.pdfIn PDF document text
    • http://short-story.ru/upload/file/93722462729.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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 10784 bytes
SHA-256: 5e63b30e706aefc55059505cc8d4ad2b942f7c7d2f86614d04173fa4dfa26e91
font_02_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 17992 bytes
SHA-256: c897634884afa1e28e17712b9d3530f982314967cbf735235c06b2ba995f7482

Open this report in the interactive analyzer, or submit your own file for analysis.