Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a49f4a72ba7d175…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 20:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ae5c5c13a60d229dd86fe54fd045ecaf SHA-1: 22759be2b8083bc0c8e3f81703cf5c03bede6247 SHA-256: 0a49f4a72ba7d175db4c2c4378fcf62204f6e5d09e7731a892ffb5bf0f483dcb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://wolfroccatiassociati.it/userfiles/files/93761625099.pdf In PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/90821800534.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/wimefape.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1875d042f0d3f84db2ffaaa6f2a3d1ce/30181285921.pdfIn PDF document text
    • https://digireg.es/upload/96691502539.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/67608326535.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/72355254800.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b3rn2hfj0q8d3d87sge6lnjn7r/37259689863.pdfIn PDF document text
    • http://email-database.info/userfiles/file/67615274595.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/10125028172.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608906ff3de97---gerixuziwar.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/67262361142.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sevedosezejelige.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/51282707487.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072787aca5d1---85908507658.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f3c86bfe188a57761282309f99055f20/nowawoxepabikefadufozot.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/vigunidetikofek.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/lorerarubukelufun.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958bbbb8db---kozomupap.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f53ba57b---larogosa.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/74249075855.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/75351214196.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51225644321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+area+of+the+sector+of+a+circlePDF link annotation
    • 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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 18304 bytes
SHA-256: 7e13ffa8e2b23498ee3bf97fcbf3f9844a0d4f86790f2356efd027e79b106843
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 10292 bytes
SHA-256: 30f80a237eb4ed7805f656df8a0f695cebfd560cbea30cbfae4b2a7e8c626b1a

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