Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3222ac7f072e1b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 20:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87603e0987420bafc61b5fbfa5f1bfed SHA-1: c88fa34b20fbb00c3e7014f3d1b11866d25280ec SHA-256: ac3222ac7f072e1bd723fd10e53876d90aa7f7d2ca4801a772d78a821b07a0aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. The file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form upload plugins, suggesting a link farm designed to distribute further malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=aortic+arch+anomalies+pdf PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dcd07a25b---gisefumogapawipuxore.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gatofu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123569691999---liloxojakurajadusekupuvi.pdfIn PDF document text
    • https://areicon.com/images/file/63174858441.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1d30d701190f5dbd5eea22e26d288b51/kedivowilajorax.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/miq40c0igfhc0ud1ums4te8nb1/negegisepupejekubo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/62777444738.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/dizevuriretizonoti.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1245d6d24a3ce7bb0e76912fde2a1084/55997812165.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/20557142243.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/6139643493.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3elh0r6mj75gi14uh0pe7m2uf6/duvowejigexom.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a854c882979---xasiruwewumar.pdfIn PDF document text
    • https://digireg.com/upload/taxapubesix.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/53403648953.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096adab23f52---38739152800.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/litubizekudusiwozo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6f12e75408b36aec2cbc9c7d5e3bfedb/mijexegafoxowakozutixiriv.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/17945461267.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/44f021b2e5ebfcc516d32a511823dd6e/pesodajezejirax.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/fobitizepese.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ab4e3b595216c517e1bcc990f322c9a/97454967958.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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 17816 bytes
SHA-256: 92511757ef7fcc31f6482d847f9b7b4aeef1293c3d8865071bce01560091bc07
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 10868 bytes
SHA-256: e007ba26fd4c82ce0dd860b342e3b34aee6a30880a84742d067e35702a169c90

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