Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff796500a556ab2d…

MALICIOUS

PDF

103.9 KB Created: 2021-07-09 15:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70ae5af8f243474e0ee2e7c877b7729c SHA-1: 9f3158323350e295f770a4448fcdcfeade9e6387 SHA-256: ff796500a556ab2d56da7d4643d9ddd42ff12c842bdea28edb34cd8838d4c14e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, which are likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://medvor.ru/uplcv?utm_term=types+of+contour+drawing PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/dd67b5abbfe4933455cc5b38d81dd996/93163330314.pdfIn PDF document text
    • http://chikatere.com/Upload/files/rujotorinigexi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/numasofogavo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14dcaab51---xutajuxazogemefedekina.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72395632e---pavunaxipaxokozivipuwet.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997e0b148e---72519350402.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/oilss2uvn1tc6bl79r522f0gl7/lefesorupuvo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/20950950266.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/16421d5c9d4bc5bd451ed969c85dad0a/bulexanerinoxuboli.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/27040358892.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080656951440---botosagowajokawapubanu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/r0se20b5s9gsje7lvks76qhfj4/96241021526.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/32564197263.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ad428ab772c215e5cce3a5d99de02b76/42874272647.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d53dfed481f626c72ebed13fcee3eb9d/34736154036.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/lufewi.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/dilivoduximitisuwu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kmq02lug9s39h3p3fdg030pgv3/77307639328.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91512254313ef427633d1abfe9781ef7/jatupafaxarota.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/243d66bcb635ae03bd61c7083e13fbdc/mexidadoje.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c033da4ac---sinifugetofad.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de768de6ece---vigifalup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9345492670---95405889480.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/33181620551.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949bf3a714f---80370950313.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5de82k1cvlid7itqa531mpcnpj/80090998426.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_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 11012 bytes
SHA-256: 2d803a2ad667c474dbc54e36670da019a157b7bed4f9885abd0ed5b65f55ac6b
font_02_sfnt_off00015ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC2 21592 bytes
SHA-256: b3cdc832735a7919c72e1665f5adc4f495f917d5c145a8512ec2cf51aae69e1b

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