Malicious PDF — malware analysis report

Static analysis result for SHA-256 6662adf19f9de49a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 18:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee417f77993cc5ad7ce900dc97e129c5 SHA-1: eeb639bf65df2db6f57bfb59c84ab98d2d61c2b0 SHA-256: 6662adf19f9de49af0268644fd51ff23c6a7d83b126076c044baec66b350da93
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 phishing or trojan payload. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://muzeumkonstancina.pl/attachments/file/potafasewox.pdf
    • https://mikludava.lt/images/files/lileje.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140938a72973---11434144707.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/60471316066.pdf
    • https://diedacorporation.net/freesiafiles/file/reduxobemanorowagigi.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t6qh9fpqqpnigof3v2j91dt533/woladerev.pdf
    • https://glycocalyx.nl/userfiles/image/file/rupurememevanojivevupobow.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f491e3d516---wesupajap.pdf
    • http://alltechsro.cz/files/70527653507.pdf
    • http://qlionshousing.ca/userfiles/file/koxodifewetaf.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d275113b96f1255aef61c94757407f35/woxevudawulomodifisa.pdf
    • http://kruengrangthai.com/files/files/36201153468.pdf
    • http://restaurant-lyons.fr/userfiles/file/kufifatunus.pdf
    • http://ovecollection.com/royal/admin/images/products/file/85019016929.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0st14s7v5s7uqd45btih5runk7/68883690533.pdf
    • https://heatingboiler.ca/fck_upload/file/86101004736.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/mefekedevopaxikop.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27746374173.pdf
    • http://incomingmakedonia.com/files/files/64115657254.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/danagedezi.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/56274943470.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/5699743541.pdf
    • http://commandhousecreations.com/uploads/files/86284111189.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nom+001+stps+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e2.bin
8dc467d921638765d21b5132ef3aed7335d0be1acc5f067bb2a433edc481dc15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 19320 bytes
font_01_sfnt_off00011988.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 16792 bytes
font_02_sfnt_off0001319f.bin
e82f37f1189a4bc4210a8fd86438a1a8ef2bb46d03e8913688d37247e5edb379
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 10176 bytes