Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf65e23442ea146c…

MALICIOUS

PDF

102.5 KB Created: 2021-09-07 19:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a401ede1833f35cf230b3af8ee5d9e07 SHA-1: df76d4ecfdb67de059c16feaeefc9175599dae13 SHA-256: bf65e23442ea146c3641b73d270ce79f5ea2c820bca8dd3de0e3f7f0d7cfab92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9667

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://brava-ekb.ru/userfiles/file/pifewejuseragun.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d0763e76---rixevep.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/batososokoz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b1aded91---dufejukozawevaturipif.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/71943739476.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/meramixofabivom.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/63de1d37162c6dcfca7e2c2ce061ed5a/vezevajesuzipigevizuzure.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e76d6b5cb---gepujiboverijevixuvidi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/sorejin.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/73492206954.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/wojaramegefegunuk.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/fodegotemepesawunuri.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sa26krhmbl5ehdrr81gi6461h7/54862103967.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fugopezipivipusozif.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/37205238846.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611869e8ed756---36583039350.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a633107012a---lilotize.pdfIn PDF document text
    • https://ebooksweb.net/files/file/69580916712.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/64410770424.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a172e59dffa570a11cb8eefc05433109/zelutomuzizopuku.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/nuseresutigodidavesurog.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/vovebilebixenojenip.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/50083945577.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb4527f22b---mugosupevuwi.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/sevolo.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/7745896275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=felsefe+nedir+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001718e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1718E 17032 bytes
SHA-256: 71cbe890d626d1b7ffad4dddf542a3d0287ca2a8da46ed0b8d9a923c2ade55fe
font_00_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 20192 bytes
SHA-256: 3bd09cf032fef46f25b4177392dbbcf8285f48984fe27edf45ca6d30f747b802
font_02_sfnt_off00015b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B17 10088 bytes
SHA-256: 1a624f5142c94a53ffd05bd2c5ee93af9f3613ba5ee13f88ba01a89f0b919da6

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