Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a9de445cf139ee…

MALICIOUS

PDF

75.4 KB Created: 2021-10-13 15:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f4cfdbaa47ac0e6e88f5d43be5780a5 SHA-1: 22e3adda7dbf248d66a0c44195e926721ef9cf1a SHA-256: 92a9de445cf139eea904dedc9f7fffb4f9ec107c9101480b33835a15b0158c1a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains hosted on disposable or compromised infrastructure. The primary goal appears to be redirecting users to phishing sites, as evidenced by the numerous unknown reputation URLs extracted from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ebooksweb.net/files/file/xeruwo.pdf In PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/69482515070.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9eb14e6fa9acd8aa6e6dc644bc466ff4/walutowijarorawovetepamoz.pdfIn PDF document text
    • http://sayarbobinaj.com/file/5346809803.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/55871616058.pdfIn PDF document text
    • http://lejuriste.ru/files/file/kogevagamulopurejotijo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/85a2cda67da1e8825eb956ad9e2d2d1a/90859466124.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89984425578.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/80307626761.pdfIn PDF document text
    • http://uteambio.com/upload/files/mubepunusetonatebo.pdfIn PDF document text
    • https://e-midas.ro/files/file/51891570640.pdfIn PDF document text
    • http://csp.hu/editor_up/diredunonebezapozu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16162123e42392---juxeguxu.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lageropade.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcle8vovr9a5hgl2a9sl7nev92/22975419187.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/sivexitegidamuxotafufof.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/93997451410.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/veziviwetixo.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_7D075DA4D9877569.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/30309276940.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/vozesekiboluwofesejexu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=condensed+structural+formula+of+carboxylic+acidPDF 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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 11124 bytes
SHA-256: 08f93f045c1605b1fe1e443d16ae311d4f35f90bdfb01ffe10e409a9bbfbe071
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 18320 bytes
SHA-256: 019504791b5585350834fa8d219448bca26e59580f06d92c562a1ab48bc8ff2c