Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8a614ea54032b5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 17:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0a9a3be1d1cf97c4a0a6feff23586f1 SHA-1: e111d73108e7f3c92565808712d27ea33b264112 SHA-256: 0b8a614ea54032b599ccaf3601fe9b587dc0f355534fd9802356da6d28cc5a45
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised CMS uploads, indicating a tactic to distribute malicious content or manipulate search engine results. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://manenshop.com/upload/files/xalawut.pdf In PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/zanawirigeja.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138681d01b52---rujapidoribexomot.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130536051338---potizufo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614556f1de23a---lujad.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/79063654170.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2b552d19---liwituxitiguwedilogo.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/24042072715.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/nexapugalumifugu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/99903384574.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/miruven.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910090057350.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2ec7efde45a52b2c3c26fd75e5f3dc77/wojezuxutofu.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/mevatanetomojonefenuxebos.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d70b7e1c---jukomosiveveja.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wupojixatinaw.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161449ce1ae4c8---jadipidijefup.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/tufejigivaxowumax.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zurerefurigapipizegak.pdfIn PDF document text
    • https://stopserv.ru/files/file/bofezarodakedovedode.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/95261379221.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/29952181618.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zulidemunu.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/gosetifatifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gung+ho+ken+blanchard+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10912 bytes
SHA-256: 141fb55655fcc86afac4786ef6ca952bef33cf36410d366002901d1d417b3d86
font_02_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 18068 bytes
SHA-256: 6d8209bda4adf899b1b56ca999e6b9345f40c3463bb830008b66e42ed4778e24