Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbc8b0f49cd1e09…

MALICIOUS

PDF

74.8 KB Created: 2021-07-02 01:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc6a99efaa1c65b73af781df65c3a5de SHA-1: 70018ba9770b16760833669fff47f5781cc99d3e SHA-256: 3cbc8b0f49cd1e09a742b93445e03b3d3902ca4bd8dcd16aecdc5d15e19cb2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests it could be used to download and execute further payloads, aligning with T1566.001 (Spearphishing Attachment) if delivered via email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d1c5da1a---2807129873.pdf
    • http://ventilatoryzlin.cz/images/file/pipewogujezun.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d0bc16934551588d625a8bfa11cddb1f/rulevoz.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160825f9737a5e---52205401274.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8bd95317---rebaxewunigalusuj.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c14852e71---pavuxufitugalilife.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9db848e60---18457815311.pdf
    • http://asianmosaicnyc.com/userfiles/file/batepitotager.pdf
    • http://liebherr-tr.com/userfiles/file/xigiratimenadoxonu.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c66e0d91f224e1c688dc50e5f883a281/penesorigenu.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1e44168695d12365e93bfc728389a7d8/pekasezurarof.pdf
    • http://travelport.pl/userfiles//file/62571072085.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c67e66cb7---ragivujivaritupedigox.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pe1i3g9c6glsr3lkbc7kac42sr/28651668971.pdf
    • http://adance0112.com/upfile/editor/file/gomajep.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dj4od1b2rh1msclgtocdi28k96/dumeninolugoxewupit.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ulss3n835rs3cdqssgbflpb28e/lomegodinexaderumalili.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/faetdt5ab1rsc7csur4d3aoap1/85070443226.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210624_FB39AB23BC52DF79.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6449043054---tewurotuxegepebimuvoza.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf4b3af88---kapojupabusasudifelasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chapter+23+strayer+outline
    • 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_off0000c326.bin
03c15f61237b55c8eb1f3f890b2707d87e9d8dcc299dfd676a731d1f788b0df0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 15800 bytes
font_01_sfnt_off0000eb61.bin
00476e8a382c87c06c37ad435ec6d9735e7f1eeb6da713440f149e1038440858
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 10888 bytes
font_02_sfnt_off000104a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16792 bytes