Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b1e4c3836e7a62…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 08:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e7248bd8bc54764d748411bed600a2 SHA-1: 21b2a6d5573ab4439d2278e5a9853893359b0b4e SHA-256: c2b1e4c3836e7a6249929c3b3e2f4a57502cdac11f1c61e2a3da9fcfe48cf894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially harmful content through a link farm, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rustproofingottawa.com/userfiles/file/boxudabus.pdf
    • http://chochosanencino.com/uploads/files/59521058079.pdf
    • https://oasis-travel.ro/files/93758537055.pdf
    • http://zaiger.ru/img/file/zotebini.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/40958245906.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135190a41f9f---74852621323.pdf
    • http://amadpich.com/userfiles/file/81870713128.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/74106271164.pdf
    • https://pezenasenchantee.fr/userfiles/file/70735624190.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/79662904464.pdf
    • http://redskap.ru/userfiles/file/34396968423.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/suvajalozibujike.pdf
    • https://lotteppta.com/beta/assets/file/wijunipamugaguv.pdf
    • http://chamdure.com/DATA/files/83898610190.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/45686979661.pdf
    • https://hamasataccessories.com/userfiles/files/3475908502.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/giwoteri.pdf
    • https://faresaldabbous.com/uploads/file/18433289916.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff744856cc---49667732168.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/kamovilitavabaxolera.pdf
    • https://hobbes-group.com/upload/files/4203053859.pdf
    • http://bhk-aindling.de/userfiles/files/fijofedogaz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137986d51fab---kitujulajubugax.pdf
    • http://czechdidgeridoo.com/admin/upload/file/59054903840.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce50bd1a4d---jazofaxipesem.pdf
    • http://stroyindustry.com/userfiles/file/37450412517.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dsm+5+english+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_off0000bc76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC76 16792 bytes
font_01_sfnt_off0000d48d.bin
3ae09deaccef85295d0b99a1280598f9dfc9420cfc37903e3451c1f2c50134ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 10600 bytes
font_02_sfnt_off0000ec4b.bin
98a33c8a24d5bf80d8e8ae7f2c8de13b707b0c6dc3e63029fc74cf5bcb401827
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 15712 bytes