Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60edccc7840c680…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 711ecc704d3cda0ececb7d05d58c00cc SHA-1: c0246b917024c68d8cb0837dc26709ddac4f29eb SHA-256: b60edccc7840c6801caa9ccf931f4c87275a6b9b1e76f84ff8263971501f7426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate a likely attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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://cerescommoditiesltd.com/Images_upload/files/14576322437.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ae097abe---18070427825.pdfIn PDF document text
    • http://simonide.org/userfiles/file/97598331765.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87735698168.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/gozox.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dodimodawavufigatoduzesot.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8556e08d---zujutiw.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160825fc2126e6---vafepixemezo.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210603124752.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/68002137092.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929134f0ade---sujuxabo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8b22a51c---wonuziv.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/58329648041.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pkp6gvcltg3nv0287m4erdv6n3/23419259514.pdfIn PDF document text
    • http://fructusartis.com/i/File/50878343267.pdfIn PDF document text
    • http://accronline.com/userfiles/file/begimusag.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a923076ae8b---87858576677.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8d843e07---giwufepageburolamis.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/66561522356.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xelebag.pdfIn PDF document text
    • http://benetalent.com/upload/files/pituvuzapatapodefufofo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0566fe875750f3927fa63dd65f338c2e/68515990685.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gijowodekuzupaxuzopolo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/md12sh5qlou2dsng2n7rfsusod/72883445308.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/45197336233.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9106432361---13028344692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lakshadweep+tours+and+travelsPDF link annotation
    • 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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10700 bytes
SHA-256: 6fb9d8dd468de94b6f97dad4c60dc7b04be360e5cc7de92be4679957fb901ab0
font_02_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 17064 bytes
SHA-256: 48d934cd31a698af3adff8b5982a198a3979568c494470628988170e14ec4958

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