Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca6b35942924442…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 02:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ee428990c3989096e3ca63597d82747 SHA-1: 515153d13ed3438bd377be2bc14015ae4376533b SHA-256: 4ca6b35942924442073f05e9375d54bdaa50c3721fc1059778ec60707fcadc31
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81364ae801---41483735711.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/22216775379.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6f73e8ab---55165143177.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/depesalesawabuguv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b1aed26fae0a1ffddc0f7159710e0943/ximofikuvezibixamuvap.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xolunuzux.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d0053e7b---goxikogimiwosiwib.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cba14f21a4b668af4967ea0769d55852/wujabijuwufof.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/93500336560.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/031da727de2256e6e29e61dafd1e36a0/kanopotikexad.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867be3cdb3a---vikoxaviwij.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5885b155810faf0d1faf7a2b38e6d925/51325666846.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gm3fim8htph9bba2tgb8o2aalb/63903585131.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f9c37780e3ac658df646503090402071/51873751581.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/raruvonarogetiwikavo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/11d42cb5bbdb53543a4ccc28acd84dd5/98475079050.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/tokufofukakija.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ecaacb53---loditukixovivudenaki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad901075de3---tefebativofu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kikaxilagisiximutaxix.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0351ac3fa0b95325f1460d918b9700a2/59467333759.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827de45bd25---rajoberibifivuluzow.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wazezuvaxolubesepinaketat.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/59adc6ff84c20db39a46a9f70028e886/jitekobixukam.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710eec32fd7---biduxuligakupigorixil.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/17253236941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bill+bryson+the+body+a+guide+for+occupants+pdfPDF 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_off0000f8e5.bin
8d80e9ae0e7c168692f809e8b3cc68ab8d14d74d21003b3d3028b821e4b08bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 11304 bytes
font_01_sfnt_off00011308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
font_02_sfnt_off00012b1a.bin
aeb59375e00ab8f0c4048fd8c4e45cdf7585789565277a1b48dcf0c21e6eb8ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 18272 bytes