Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4729edabeafce8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 09:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2372837a7b8916a0fb9143f8c399dd8d SHA-1: 8f9da8e6500d5b2be0bee249e5fce4cb5ecfee88 SHA-256: ab4729edabeafce80ab3a0b7fdb9fd1b7abcf094bdfd81cd8139ef766a327ec0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites and other disposable domains. This suggests an attempt to leverage these links for SEO poisoning or to lure users into downloading further malicious content, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kietminhrivet.com/upload/files/ludoxotarifawobegil.pdf In PDF document text
    • http://smirna.pl/files/file/pidiledipedi.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902141319907585.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/2534658723.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/66685113916.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/livudamujefasiguligetusaw.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41528725769.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/nodenifelosuputuwumatafaw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5f3d34fc39b18d8edaee7cc02578345/28987793248.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/32388731445.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/46120323287.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/47464311369.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/xawujomule.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/wexabam.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/34521659066.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zidaxanerukipilopi.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dubolufuzajesuluvudejuf.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a441fb8a74---jodirebeva.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/67345797246.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d075ed924cb2e34517360b701e1d831f/gagemadiwibajiraludef.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/64145482301.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p64utvct2j3jhrr0o1ivtsbnod/kevodovarawibufasewos.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4fa56223b78dad6a97758f109e1f3c65/25815101182.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/75754311421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=paired+t+test+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 10240 bytes
SHA-256: b7eb24d52ce68b866bd3bf6a295b00eb5dc35478f298186e305ea36e94d69618
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 17516 bytes
SHA-256: 83d17f241f90e9a450bfd5cce71b608e0228dd0f10295f5c57e932969296f1c0

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