Malicious PDF — malware analysis report

Static analysis result for SHA-256 d221163772addcd4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 13:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e39fc9037cdf01174650114b34e941fc SHA-1: aab8c2b3c4a3b3f9192d107aece9d8b5f6e9c7fe SHA-256: d221163772addcd4d7e0ef5e102b93bb8d6d467a89d0ea3e9c4477e4c3cb4887
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of PRC/3D content is also noted, which can sometimes be used for exploit delivery in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://allytemp.ru/uplcv?utm_term=mp4+cutter+apk PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348865531d0---74423888762.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lasepasisariwer.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/86651291131.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902202848918986.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/jigapixoborakugigewafek.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/9182166132.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/21494664024.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/69067532580.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33f1e8d05---44050804863.pdfIn PDF document text
    • http://turatabor.hu/media/lodurezefiru.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8638bdc---48148007927.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134149c280ef---xakalowoz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ace448a2---51597995415.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ridokixupabiluj.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/12715327743.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/96402935746.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/vijesedidazigop.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109011649276735.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301895a0013---46427736885.pdfIn PDF document text
    • https://angkagenap.com/contents/files/zewom.pdfIn PDF document text
    • 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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 17716 bytes
SHA-256: 7a29197d5876acbd49705368bda444e2c5068ff28b15fc0172aa0c36c9461da8
font_01_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10100 bytes
SHA-256: 82bc711ed254b2c3a008a7599bf1801ea85f973727d513084ce0ea658367fd7a

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