Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a32438677e2402b…

MALICIOUS

PDF

118.4 KB Created: 2021-06-29 15:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d0c2f0a9caed65831fc6022ee055e50 SHA-1: f4673b0b15b5c2da6f33f8f7c3c1191a774d3fbd SHA-256: 6a32438677e2402bd9d2683bf85f932f9bc2355d65f2687f3fc52678d36e8bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and other domains, suggesting it's used to distribute further malicious content or for SEO spam. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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=there+is+sunshine+in+my+soul+today+meaning PDF link annotation
    • https://alexandrapanayotou.com/web/images/static/file/60493103110.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/vuxixi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3a8a915e---sumidupazu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/99898542483.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7ijq36l4s6hotu9iv3n1tgpm4v/29037587962.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/37807360061.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/65053309785.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/10458829071.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1aee64b5cd5f6f1b023c63bbbc4fdf74/vuget.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/72829100201.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595e57f708---pujixozozugawi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7bf1cea80---29327357197.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/29647276047.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/fekokofunolejita.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bac0e7cd9451f387e4ce6164885e3f5/74509339254.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/19512ed84f874205b5414986faabce42/javanonibegidirolipevugez.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/depatarumakapodokifidawi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1a9afaf9ab9f59ecf0039c3e02eb0258/40768213720.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/4el2pkqcfh82ahe85in7br2ehc/24061260333.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/29618899166.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57ce59d90---37369202922.pdfIn PDF document text
    • http://akssert.com/userfiles/files/32238622187.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f04abbfebda99442837e8d2802cf3be1/34917504828.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5420056f56db533af96f0313cbec1794/94073537856.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
stream_004_off00018243.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18243 25948 bytes
SHA-256: 82a935596600f1974ae478ebe50bb488b49566cb71e8f88e59914f28d8aa34e7
font_00_sfnt_off000134da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DA 21040 bytes
SHA-256: cf8e36feabe5cc2269d323796060a61422aa18cb4c26c733663ec1bbd03c065e
font_01_sfnt_off00016a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B12E 10872 bytes
SHA-256: d60cf8a61dad19c7a6de1a7fef2e2361633d005294a2c5ee842421beaf315f83

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