Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e3a6d5f2ecaa3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 22:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 776e646e230ce2e6c94d838811340bd0 SHA-1: c38ca012aa24d706a53326bf4c1373fc7b89cffc SHA-256: 940e3a6d5f2ecaa37a3a5959fe26212f00ba3817f626b6ba58846dd0805abca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=eac3+audio+format+mx+player PDF link annotation
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/bopuli.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jewepewi.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/82342450503.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/71965709496.pdfIn PDF document text
    • http://belloverde.net/emailer/file/87179637623.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/kuzanonoxepimegomi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/98751846387.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/waromugizolujokagazirazak.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/lijulipebu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cca91b4b73a7c3fcbce0dd13add2b550/37907034667.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/50857833949.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/vimudobudipebov.pdfIn PDF document text
    • http://lactopad.com/uploads/files/rurogimake.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/94877241399.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b58153a45ed703ac16a278d1d7efc104/63748745381.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362bf15dc88---xalukojuxuwemi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/22219543370.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jugijomelifatuburogis.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/73278899234.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/wivikedebuderaleri.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d34dbc767---pinenexotog.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/10650707263.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 10980 bytes
SHA-256: f471c94df0eae3393e1dc6d9e25b05c8ce3f25c12c141f013b2c3cd63a8d8fb3
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 18676 bytes
SHA-256: 2c3a8d3a2e448351bda9a85d228e9ce0bc30f064287d1756e7109620763683fe
font_02_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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