Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad19bb75b7f53f9a…

MALICIOUS

PDF

66.8 KB Created: 2021-05-30 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf8ee6c6b801a0f69437a17162f5573 SHA-1: cd04185af8e429bbebc56a58886c1fb05d85bb48 SHA-256: ad19bb75b7f53f9a9d3237096cf52fe54b49589e210b6920d64dd20007355490
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by ML and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress sites and other domains, likely serving as a lure for users searching for specific PDF content. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8894

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=reparto+proporcional+mixto+ejercicios+resueltos+pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d47165c8b06bc5f2cb69973eb737a9ac/21652590682.pdf
    • https://ivanamihic.com//files/47705246315.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0npsrl8kkvsuknprl33ll51dc4/66975130902.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607625b776067---xobapalagefe.pdf
    • http://sattamatkapatti.com/userfiles/file/45330402297.pdf
    • https://x-software.cz/data/file/tufupugo.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098e7c5e8dee---12301914206.pdf
    • https://alice-immo.com/userfiles/file/81201761122.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcf8b1b0e4110522dec930e3738caf58/60180495133.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ae314a0c8c8d17ecc6b2e70a34539383/xodasuxozalevipuro.pdf
    • http://ceskylakros.cz/userfiles/file/13703733747.pdf
    • http://alkanboya.com/files/file/%5C/nekumesepatedexasepiwug.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160861dc3976f4---44846398356.pdf
    • http://waypl.pl/upload/File/53994295707.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d843.bin
692af46795aa10eb55097be76689928d02b36c14c83e8fec5230c9a8e592c3e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 5452 bytes
font_01_sfnt_off0000eac6.bin
508ae9515cba90533f56bb0538f3aa2ef7ba898c4439ba4d139eb29006c0a1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 12040 bytes

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