Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcb46e05a17e8c6…

MALICIOUS

PDF

86.1 KB Created: 2021-08-17 11:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04e810a21bd5182e970aa35c52ccc646 SHA-1: ef836346e5a574cb43b56efbb1f9f07aec666ca0 SHA-256: bdcb46e05a17e8c603058fd61bbca00e04fabde0868ac63982820404f43e62ce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests a redirection scheme to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maihiendanang.com/uploads/image/files/wanasunuzoxuf.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/007d8c3a866807a54772c5f3da2e3ef4/71951335178.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096638869533---duxijeze.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bc52c930---lulokasuje.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/larenejiwuduzagokemen.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/67410110257.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef26cf127adc0b6bfdcc8c09aa9648a8/bejira.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/889632383.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5ed39cc7e1387690710c364f9126bbf6/97857376507.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gbia9gstg7l6bpc2er3rrgj5c1/giwoxubago.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/60872566900.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fb4abd13---zirokisafase.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wovakoti.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083653e81b12---28155965472.pdfIn PDF document text
    • http://qzgj.cn/upload/file/tawiboluga.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a5d424ad6---koludemomarovadatu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc522c04a22---27692112480.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/975d2e036d0878680cc939d327727391/viwototuwi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98a3c461f1---xikawipujaxaxozezibiretep.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/lexavezegon.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079820cb1f39---21815792092.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/76306101120.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/jetusasofejomuralu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3ef00c68---beril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+check+engine+and+chassis+number+of+carPDF 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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16628 bytes
SHA-256: 7a7fe6b1bdf7dc10493b724cb9a61339ef1520a0197a1255df49207b389d303f
font_01_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 11284 bytes
SHA-256: 73c4112599add17956cbe078096efaf59dbf4e7c5fefe0a8621eea01fc352111
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1