Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e2d07c743fcf2b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 16:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c7e189eac830068b5c5d2f3ef81643 SHA-1: 18af8c38658ee32c13f46a994f855c7d0bb725fd SHA-256: 76e2d07c743fcf2b9d7d439a0e4c1b8b71aeb3630527d609f8bad88d98fbcb45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://tortsurprise.ru/upload/redactor/files/zorixoboz.pdf
    • http://hsiwww.com/image/files/20210623_154952.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/216thii22a1vqqv57toi81tg53/lupukisuxivagekomuparuj.pdf
    • https://deepankarbasu.com/FCKeditor/file/belukobalamexi.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/85903934434.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6395e4843---fufuvanubevi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0008d1ee0a---73250546038.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d08d3c4966f2c02f0cb27897a353aee0/gukuvunujarogak.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0k103rk5miu8qphfeit35pr8q7/36100969816.pdf
    • http://pwr-tech.ru/userfiles/file/zajozulawerejopifibizo.pdf
    • http://nct-vn.com/userfiles/file/13248078438.pdf
    • http://yomamasushitogo.com/uploads/files/furokifavisaguk.pdf
    • http://textingrights.com/userfiles/files/6181251354.pdf
    • http://andlupa.com/userfiles/file/61100418637.pdf
    • http://smit-electronic.hr/upload/datoteke/gowowirezilize.pdf
    • http://king-ber.com/UploadFiles/file/20210704085451851.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ea4cb0ef---62518960277.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/38ca74efe101e03eb258ce39c421044c/mowejawevonima.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076592db0e9a---52313533286.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607547dc9e54b---zediva.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/db8804389af324b6617d073ee86ef486/wuvisuxamejesir.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c29a1166---22656928380.pdf
    • http://sartor.ru/upload/files/fusuwiforu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2+player+racing+games+online+unblocked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c7.bin
b9733fd56bca2d572e74a539d021c9cca1e3b3d28d6789f3531fc9e324f8d204
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16792 bytes
font_01_sfnt_off0001209e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16792 bytes
font_02_sfnt_off000138b5.bin
67b061df0b2595aef4c7f974336a11bde29be09efa77ff949d2b59e1f6df7a72
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 11228 bytes