Malicious PDF — malware analysis report

Static analysis result for SHA-256 416596091cf9de15…

MALICIOUS

PDF

101.4 KB Created: 2021-09-14 01:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef74b6d20f13fe3abe90d527556e86c2 SHA-1: c8f3427685c4a6262e6c33c6a24f6087fb72b578 SHA-256: 416596091cf9de15c59025b375e5d7ca089f9bee4e836759b447671b54a1711e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=real+people+doing+porn+videos PDF link annotation
    • http://enewind.com/pliki/file/jimanunotikefedubolu.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/92087166465.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210904_98b97.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60094389071.pdfIn PDF document text
    • http://lejonhund.com/upload/69584886200.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cfe70a95---jisiwib.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/munoriwuxewe.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/7567892680.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/90537509924.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/95b6f85570b84b0d02637b5f3a416c7b/pavavuxorozejawiwedofovoz.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58399529110.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f7eeec5---40620717779.pdfIn PDF document text
    • http://ed-union05.ru/files/file/91728586675.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/60735007146.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f464ae6---fovibenusuruxivika.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/18515481515.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/mujilo.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/latowizozogusasudulu.pdfIn PDF document text
    • http://namngonviet.com/user-/files/lovoba.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/79314094007.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/83887873942.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/80074926922.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/mojaxexokakunijaporaropan.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawaralusetaboxiroxu.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/zimowatipolimefike.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/22822388146.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_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB6 10580 bytes
SHA-256: b3b8476e8c7797cd175fff44a96df57a2e5f3dd0ff30ea379f3ac39b78d7f010
font_02_sfnt_off000156b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B4 18868 bytes
SHA-256: defd895e96a0195b2c7037b6bbaac5f1cc5db86a789756b7cbf91e48f2c3a7ff

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