Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abdf29b372109bd…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8ba216fb0b11ae6c8321e19a0c5ebce SHA-1: 7ab0641ff9cd937cdf3339a2d66cf4a71c84a2ff SHA-256: 7abdf29b372109bd5bd29fb2754534aa5d9bcbb5fbed4b140d593906f0088e12
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=tips+for+a+job+interview+answers', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=tips+for+a+job+interview+answers PDF link annotation
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/id5av4cb6h8h8jurch9tfs3642/dodojijibubum.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/vuxotemudinagul.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c265b664c13---34581526628.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kezulimawep.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752e3e89604---judevaranamepilu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/aa83c4d37591571520cee3c867984a2e/bubebijumigafokunusipo.pdfIn PDF document text
    • https://emmaushuis.org/pages/xirulobosigutorazuzavoxe.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/66469681904.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3d7a0576---28292539094.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868f098d7f---pixunalafafebib.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/48371891303.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086193654024---bevuratigutatajapisopa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7abfed916---bitamit.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q8r8ar4ugh5qdjfpvmv4ttb85i/81309034455.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_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 17168 bytes
SHA-256: 05e9298ee38e645ebf03bdd540a0ee51b829e06570ec3a98aa4fac48fe03b278
font_01_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA8 10688 bytes
SHA-256: b9f309c1060acbce7a8d0c7e51a83f46510616dcc16dd8ed4edfb07c6ea86f1e

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