Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64c0d137676670…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 21:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee3c30f8d0ac22f2211b153590d80778 SHA-1: 86dd2467ae66b26bd015f172afd0892847dda77c SHA-256: 5c64c0d137676670f97bce20074f6e458bc00a8a61dcc032821eeb5da7059eec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161333920ca48d---zidarelepuduwuvegezava.pdf In PDF document text
    • http://rmgoals.com/userfiles/files/51604769116.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tujeluz.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/18429072684.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/negumowidowe.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/76118565988.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16142adefc3394---79351228960.pdfIn PDF document text
    • http://offerparts.com/upload/files/12770218674.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615667c7f11e8---kogaka.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/21690721132.pdfIn PDF document text
    • https://palet-school.com/files/files/62483344905.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/kalakumezedegazedeteze.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/puragalivuxijedi.pdfIn PDF document text
    • https://togeltop.com/contents/files/71285600313.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/fujisuruvujivoxogigez.pdfIn PDF document text
    • http://totoumi.jp/upload/file/leromowesuzakolexif.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161504968645e0---xumexediguzazig.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142941e5799d---xigigat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b600485b3---22914574714.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/52308060831.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/83263160950.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/96590141525.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/48516626325.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145c5ddea3a5---96055724845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+1+euro+truck+simulator+2018PDF 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_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 18792 bytes
SHA-256: cbe02ecedd3b80b8f95d2217ffe0e615f7177a2d56655a18fe158c4f483fc725
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 11204 bytes
SHA-256: 51f02835063f8b646220999b7cd291e75a30199599c849561dd22e2626de2103
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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