Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4b6f5163c4189f…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 20:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb350dd24e38ad124464f5d71d444b0 SHA-1: 4841ee6c32087be19a03d7f674f6456466861992 SHA-256: 0c4b6f5163c4189fc6ce23d8449f8e96966950666654c076e8bc8b1926d50215
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/g06eps3jprn827os2mc7l6of8u/bimusujabevaboxup.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe29b67a8---kalamegivopegufituvonu.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cf062598d87cafed779d6654b8851cb8/zejabinazewile.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sqctg6jdo6k83mmrd3h06cs7o2/xewenubapuzope.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58d32ae70---21437025420.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da191cd198---sigepidefawekidomujubivu.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b86ee35dac59857cf782325731d2923d/tufagarerepuserowar.pdf
    • https://tecnibat.net/uploads/archivos/18008423269.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/66841426819.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/289eeb773f574d055bf3c0e1a93fe6c8/47680966342.pdf
    • https://dietacud.eu/upload/file/powakewon.pdf
    • http://studiobardinisrl.com/userfiles/files/16686745701.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1270fe6fb25fc31e28bcdfaa557143b2/zaminused.pdf
    • http://clairvoyantinfotech.com/demo/images/18355556640.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b2375de3---setigixukelowewagupir.pdf
    • http://bwc.lt/i/jadubavubaz.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606142d38---fozibedul.pdf
    • https://sasalidayanisma.org/uploads/file/74531618927.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fef2b035f---xidofutofazivobe.pdf
    • https://ajitcoatings.com/uploads/jimake.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e0b8c8ce997576519b263289bb0ebe0c/tubapumukapavi.pdf
    • http://muzeumostrowiec.pl/obrazy/file/20705658284.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pelvic+adhesions+and+infertility
    • 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_off0000e875.bin
e46398fd7d6465382b4b938ed7a5ee6baef8199f3bf89c159b83f43cc9d52701
pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16572 bytes
font_01_sfnt_off00011380.bin
ea4a0f6038155d69ef6eb8e3f56cda11f59945bf3589f341a04c01082d5d07b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 10756 bytes
font_02_sfnt_off00012c3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes