Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0fa882feb99759…

MALICIOUS

PDF

116.3 KB Created: 2021-09-07 12:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cdadccb09807a9cd418bbb3b6c69486 SHA-1: 253c32d73cf7064d1fd9ae4f80d27dc8c129cf7a SHA-256: 3b0fa882feb9975983654cf22b278b0b9ad2f5df5d12b901eee3f2a3568a89cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of embedded URLs and the heuristic findings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=convert+pdf+to+html+program PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3a2dbb6bc53688c0a99b4bb8e1c5d5da/zagufexogusotiruk.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/peumnr8s99p57b0memtn7uuku7/nilad.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/zijamowogikenu.pdfIn PDF document text
    • https://teamcode.net/upload/files/duxelozoratuzifalepa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd4db84a8---zoniligigakizusakelubux.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210526060339.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/q68se4rh4hqbapsldg9b9oq2da/27673216918.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c22ca152fed2337a4b54b2cd5a172f7e/woseraverovawenijeximu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/vegojotujetilan.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/gesosaw.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160853f584d7e5---xinudamediwimu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c621283---31900618743.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/dujem.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e9306fbadc98f7d73194f6dc60c794e1/1811066800.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac1dce3c1---monikawawadow.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e912615b5e1---baxizef.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/98846512717.pdfIn PDF document text
    • http://juha.be/_files/file/relifeba.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba29dfa69cc---lumamilitiwulelokadesofo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c31b0f69e98b41357137582fbfd5194/wizawovaxi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f91b52e13---30017255107.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/vajavazus.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dbf4f1a4ccc19c5a517476c6f37f2d30/97072588399.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7c75270ca---19258138505.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/komemepanurolin.pdfIn PDF document text
    • 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_off000166bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED1 16660 bytes
SHA-256: 60ae4f227bdb44d121f9250c2fbb4a744001a5b59668db82f2cca4dfbbb71053
font_02_sfnt_off0001aa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1E 10780 bytes
SHA-256: c842455a0e85cd09bb4d447f509f0526764fe8b1d07ba9a001ad61e00401c2a1

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