Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee0d4143678ac44…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 07:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf3ce406a7f8428363509240c669f8df SHA-1: 0de5e318025417a08c8ebb61f47ac13ec2f27134 SHA-256: fee0d4143678ac44b224af67cff298668f3d48b76c9caaa3110fa16d18c6a363
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/511235305b07522e95dc9eb21284cf26/tidizunipala.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/josabegokojidepifisunaj.pdf
    • http://teormech.ru/teormech/usrimg/file/80385359091.pdf
    • https://marblobathware.com/app/webroot/img/files/rexin.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cff323a40b5c935f5a7b87cb508a3f60/rokenirofurajopawu.pdf
    • http://jfhconsultancy.nl/userfiles/files/88676226227.pdf
    • http://vidol.eu/userfiles/file/95369479078.pdf
    • http://abacusnancy.com/userfiles/file/81894087488.pdf
    • http://zge-led.com/luodan/images/userfiles/file/8742927247.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gidejigigewobimez.pdf
    • http://abbuffalowings.com/uploads/files/tenemabobasagejezum.pdf
    • http://4reality.cz/userfiles/files/10782401354.pdf
    • http://tamlaproject.com/userData/board/file/19386682010.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/gatanafavov.pdf
    • https://10glazsikeyrosa.ru/file/52879473509.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39f34d74d9ca609b5d8cac8379ccf046/woxadum.pdf
    • http://csc-020.com/userfiles/file/20210921002100_xgrthp.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bad84a05---wujajegixowuwenekizave.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/54041139320.pdf
    • https://aarhuskortet.dk/images/file/dupomuxe.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/kinivateripa.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe26233b4---79697677791.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021092217253173499.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mock+location+fake+gps
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 16792 bytes
font_01_sfnt_off0000dcff.bin
0dd5666349cf10361fcd5f23dc27af6a11dd8e46a5d86b099b3ad33046eabd1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10640 bytes
font_02_sfnt_off0000f57f.bin
9df1187f1f8fdcca9de190b5662dfc45720c9202645bdefd5e7f9ca7fa154507
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 17544 bytes