Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3bdad22e3268c2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 06:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d6c6afc9e673cc579ffb7f90e9d9dc8 SHA-1: 2939a0be5b372d2e3481999b8eafde25f98fea61 SHA-256: af3bdad22e3268c21ace7a2db4c8c6c234445405ca82163228285b5070fa5bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.77ice.com/upload/files/82380045710.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612919f68431a---1184370680.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/10614059740.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/730515a91336b685c0a02482cf1eca03/gebijobazavubum.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d41eeabe---tewekexaledam.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/worovomumotoj.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80463152746.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c446e711f2a---41013174649.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6262dbfc---texodufoxigunav.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/35107779326.pdfIn PDF document text
    • https://digireg.sk/upload/larorazatikokavupefuva.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xiwig.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/12798210311.pdfIn PDF document text
    • http://splogservice.ru/content/file/23849056606.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/67112392585.pdfIn PDF document text
    • http://webs123.com/userfiles/file/90527877228.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121709f5219f---gevumupozoz.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f4aa3cc7363a9ff9580855728ed8e914/sovudeme.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417167e42d---fijisigut.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/08b8981f3fa3327adb6b563533785fcb/65386688934.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b8586f288de4870494eae0ace9792085/17922776717.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ifmbv9b6j5ckuoautvqdocjgm6/25884111976.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f7303c004d8585f16833cf2082903ea5/popesej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=evanescence+the+end+of+the+dream+lyricsPDF 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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 10904 bytes
SHA-256: 6a8c0f5faf996828526c7508ddadcfb04bed1d301420588ee0f9f90be36b9482
font_01_sfnt_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 16808 bytes
SHA-256: cc3035106acb6c7777027e4e07a46e91caaf37387f4633a569ab98ad65c6f12e
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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