Malicious PDF — malware analysis report

Static analysis result for SHA-256 9162997cdf20c47d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 10:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 192a590c8c80a30c67ec9453fc8b0e0e SHA-1: 885906e8c01462bff6f6f6202b5a169748e97041 SHA-256: 9162997cdf20c47d684a1881d58c85e4eda412c78da49d4a53fd299e4fe09989
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs and a specific compromised upload URL suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cottonweb.net/userfiles/file/zijasolasarofogutako.pdf In PDF document text
    • http://myucmas.com/userfiles/file/62507158195.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36825704889.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377034a6d70---36747549305.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/52470508468.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/58887186232.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/88415100466.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/gerikojelopifoxetafukub.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/31251972261.pdfIn PDF document text
    • http://vswet.ru/f/pifikofamejulezapolo.pdfIn PDF document text
    • http://chamdure.com/DATA/files/92610656489.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/70771690.pdfIn PDF document text
    • https://ottopianos.nl/files/duzagozux.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/buleb.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/59790662735.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4701256db---22897925963.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/18128174672.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/widexibomako.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13064a6d57e910c708722a74047b1252/nizolikagunej.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121258047648.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460dbe653fa---lonifawe.pdfIn PDF document text
    • http://juentai.com/userfiles/files/rovikonibaporug.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/64326803987.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/10222309998.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/28892503435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=123mkv+bollywood+movie+2020PDF 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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10644 bytes
SHA-256: 55c828fe244a999afc6df20a8b5144b911422c08fe75f0acc012385ac4e7b25e
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 18012 bytes
SHA-256: ef6506f8490dc320ae3c33c5472e6b34fa6184b14b00d4f8f571e0e60fe25808
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1