Malicious PDF — malware analysis report

Static analysis result for SHA-256 37af64816fb9018e…

MALICIOUS

PDF

75.7 KB Created: 2021-07-06 01:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ce624975fcd7679adb73f3ff4ced5e7 SHA-1: 4c9d68d502edfec3127a8c0a2208eb6583618caf SHA-256: 37af64816fb9018e451caf9f64a2fe0d607f1ab2492e64dcfbc907bf55f094ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094403946466---53936969763.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9119b2897---senopi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160756eb3c7456---27359331064.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/vifuwegonep.pdfIn PDF document text
    • http://tipiland.net/upload/file/rotolinadimebo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526082428999196.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d8000800b3e11a496c9828ab07c956fc/86084303417.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/juseruregafudeza.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/78765ea19b32c2a0c55dacce6b43a5a4/80451475630.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/kuzodazagexonepulelu.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210630115320.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51f7ad5d9---vilasoworamo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b723eaab---wigabidajije.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/21688256670.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/18370873690.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/80135331878.pdfIn PDF document text
    • http://debden.org/userfiles/file/doludevawuxufemixoguvem.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503287e992---36575920296.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/radebovirifer.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wevosujoforisadoperat.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fexuzax.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beaaac766b5---dawekazewuf.pdfIn PDF document text
    • https://blv.by/upload/editor/files/litogejimalono.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9718ba7ce---fonujugodowumexamomow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=amazing+grace+i+can+see+the+love+in+your+eyesPDF 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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 16728 bytes
SHA-256: c4c4d135bdec5a719141e419ebb234ebc2b2f306212c908e98fc77cae3dd5074
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 11000 bytes
SHA-256: 2a8bed8b7b7836f9ac2941c52f54f3d914180b9c6db1ed4124146f0d13a7fc90
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1