Malicious PDF — malware analysis report

Static analysis result for SHA-256 355099b08034ad5b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-10 07:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9aa91f6d07b361d2947e03de7e550be SHA-1: c94754e92ec4804d2daabfca705dc8d0482697fe SHA-256: 355099b08034ad5b3e5b66a6c5770aef8f60a596c9cea68f07f7a7ca1b451588
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting, likely to lure users into clicking malicious links. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://abwingssuffolk1.com/uploads/files/50713107635.pdf In PDF document text
    • http://tw-jia.com/uploads/files/202109011559042392.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/28417196239.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/41071509166.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/5001459161.pdfIn PDF document text
    • https://olterus.com/contents/files/12624436774.pdfIn PDF document text
    • https://digireg.ru/upload/10725394579.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/35198301426.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348f6e20fcc---30501556949.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/44489631117.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903220642742.pdfIn PDF document text
    • http://podarox.ru/public/files/16289099355.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/74101688027.pdfIn PDF document text
    • https://mihalex.by/files/files/51335895590.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/baguniporegezoja.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/98271936047.pdfIn PDF document text
    • https://scalping.ir/data/files/file/gewudurunodazexe.pdfIn PDF document text
    • https://yellowstonewildlife.com/jexireditirizafigipaza.pdfIn PDF document text
    • http://ch-yang.com/upload/files/24529126721.pdfIn PDF document text
    • http://norservis.info/files/files/28194256133.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ccd9fc60cb11b9095690b4ca8e20f2db/solubabugigetumodugi.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/siluvipojozozezoviraj.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/lakuvemuvemabowifud.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b66c40001435938f20c41af14c3761fb/zidujurutekedujaxibugidum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+star+trek+beyond+full+movie+online+freePDF 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_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 18492 bytes
SHA-256: fac27e0940e4100e3ac1caef750125409490665e0bf29f7edce951871b0b86a1
font_01_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 11248 bytes
SHA-256: 64cdab349b436fb42e1a2ce54bc9193c5687e153c48901a917782fca916ec4f1
font_02_sfnt_off00014324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1