Malicious PDF — malware analysis report

Static analysis result for SHA-256 4778ccde014c1789…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 18:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59496b457d2f5cc9b2f35be6e94a7707 SHA-1: 81d8cc8d9de3563f8edcd8cccf0bc2f29cddb65d SHA-256: 4778ccde014c178931533bf414909aa92e7e722514e6649f3836660fafa47e90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/jafodasud.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfb7ddaee---mosakakotujumasu.pdf
    • https://hbphoto.ca/resimler/files/13518252273.pdf
    • https://coverline.ro/userfiles/file/49721591618.pdf
    • http://agapetown.net/ckfinder/userfiles/files/51107635273.pdf
    • http://condosworld.com/abisol1/userfiles/files/nuzanamunuf.pdf
    • http://aaronandanthony.com/userfiles/files/87627345989.pdf
    • http://vhz.cz/user-files/tutoragusopezederu.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/16402326847.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614933feaf498---44970754363.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/rijegefulegetelobawowo.pdf
    • https://kralpin.com/calisma2/files/uploads/63609354473.pdf
    • http://ghinelliarchitettura.it/userfiles/files/niwuzizubunitojubunewax.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/niwalitilefefegasapufozut.pdf
    • https://bostoncake888.com/UserFiles/files/gironosoza.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc0843e9d---64262469060.pdf
    • https://igruppe.no/ckfinder/userfiles/files/sovujiboluwevaxufimefan.pdf
    • http://fsoa.cn/userfiles/file/kujidudarekixuwemis.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a62ed2a5f---28006707177.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/96735864306.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/67481881709.pdf
    • http://capmar.eu/userfiles/file/bufofirorolemoraset.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=racing+fever+apk+unlimited+money
    • 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_off0000b05c.bin
20942d7f053065c5cda9dbf1e4a5a4957c5d84a7db7ce5f8d90607f07a572a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 11212 bytes
font_01_sfnt_off0000ca6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 16792 bytes
font_02_sfnt_off0000e281.bin
583bbd257f5cf6f63a2d76fd4d6b1edac4f98a830b4835b3d69eba1183cad77c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 14172 bytes