Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b049782a13f57bc…

MALICIOUS

PDF

110.1 KB Created: 2021-07-02 20:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3a998579072113f013273fce5dbcb6e SHA-1: 3e71e5a67feab395c4eb4f20ee603e10cfc748ac SHA-256: 5b049782a13f57bc39c29d249798b8b0f7c4fc11f2e503a5542fcba21eb32169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=atomic+theory+timeline+in+order PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/42f0208c3e850eb750566b9c51981a18/vegonojivaniluxezewomo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c5auhh8l9h369i94g41amau87/58453755929.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52470fa2c---vilezivazowojulif.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/xepasesutuzu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a160c951851---zitilowisol.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/rupufit.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2800acff6daccbae79bba87ae2b912b8/metekexopurizepumu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/lulelop.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xegatezigo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xabojiv.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/xerodasuviwiwesaborib.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/gagejeratikikonunawal.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/b3f3eg06uva98q7plev2cjarh9/81758772153.pdfIn PDF document text
    • http://fygl.net/uploads/file/110943469137.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/metotedisetude.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/butobasajama.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/31eedcbc922da1c73a7f6789af086f1d/3498367564.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3549415ba---90841641863.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/2107454268.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7a0dfcbc99b99384d19b3ad33247a594/biduk.pdfIn PDF document text
    • http://secretinvitation.net/images/files/65507549461.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/84203820926.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/fa1fbce03780cb4f4b2306d15243e021/wepigapowesukovotetug.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_off00014ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F9 10400 bytes
SHA-256: 98b6e6e097c1dcae4955bdad37621f4225ddee21446b9e9a9c6ba698dce84a11
font_02_sfnt_off00017a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A46 19260 bytes
SHA-256: 9f4e18697e4f984efca425d282e0715d3f2a0a043310ea356a1e6ab372b25afc

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