Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0b2dcfbbb83ae1…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 11:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbeaa9dc7fb8f921f609920156f77349 SHA-1: 67155e1f8cefc1ef2bafa38c1c5c9fc04158fd64 SHA-256: ae0b2dcfbbb83ae13729c4b72e4c33573c8c770b1ae2c77b1f69bc36df66e213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/52g9hq19jv4g6044m4kgu7kja0/febiwidivoviruxulilum.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac790bba98b---38079021867.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959f4b8bc16---1763096930.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/caed11035d7604887ecdba1c17a919f0/31675745482.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c631f8c60d8---fiketedoz.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aa5665c1---28658868504.pdf
    • https://advance-pack.com/editor_upload/file/kamorupulijagikufe.pdf
    • https://alihuata.com/userfiles/file/kiromurerobisogutemaji.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609349982cb56---rogiwidapafasobalafe.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e5260f63---javutomarepuva.pdf
    • http://aep-tc.com/cache/fck_files/file/sotab.pdf
    • http://vitanova-cattery.com/upload/file/58872342043.pdf
    • http://phuocthuan.vn/images/pic/file/99300669883.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbbcac5950---fijotat.pdf
    • http://orderkiwicafe.com/uploads/files/50925797487.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/koxubowekeg.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3ff0c79c---89583840679.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51636859209.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/81781837989.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff79f0840---18529999593.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/18b84571e49f6be1d51771a1963f394a/paruvaxifururovimuson.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8db058d38---wepifu.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/93692930197.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1256feec32530d353afb5c38eda3f79c/dusaponexadixodarapazunar.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/dlg1mup1rk6cu158khbsmh6ub1/mozepu.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/feaeee1d06afd2d30b1b1efc79515fd0/nixavapexe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jose%27s+taquizas+street+tacos+catering
    • 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_off0001106a.bin
4c4371bdf0f17581a0f3c3266ea9ef659320a901a86db0450dd2f2acb333121f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 18448 bytes
font_01_sfnt_off000140bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 16792 bytes
font_02_sfnt_off000158d3.bin
d048ab2356663ce916bbcd5bb3f9dd66e77218303a28e8e733473fe6920879fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 10688 bytes

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