Malicious PDF — malware analysis report

Static analysis result for SHA-256 b491cb630871597b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-12 23:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caf37bdb44f650cc7fac1c46028d90db SHA-1: 87022f2b2a7c844078d04ea4d546ce885dc642a0 SHA-256: b491cb630871597b371ea216c9de14fd7839670ac3da0397560ac09a866e0a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm hosted on a compromised CMS upload. Several URLs point to potentially malicious content, although one is confirmed benign. The presence of PDF_URI and EMBEDDED_URL facts suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607642f45b916---17961301564.pdf
    • http://fxmeat.com/upload/file/1f4077db182cc504c1823c979a319b06.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2j7nlkl287orccc8t7iqr9039q/jiginunexejo.pdf
    • https://bestcoloringpages.com/userfiles/file/gutusowebidefodotidejokak.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b371bebbb22---wakonudagoluvuxij.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bb8a24dd1b61bf423a6f27cf0e9e7bb/mejogubuzamuvabugigi.pdf
    • http://sooclose.eu/upload/File/pusogidadukujanujirajo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608debb91fc33---19418778610.pdf
    • https://ytdrive.com/CKEdit/upload/files/68069468561.pdf
    • http://driver-jazda.pl/upload/file/5502748317.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160721df7109c5---69047914799.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2d9039a1---kufojagapenubonitoliso.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9643dab8---xefofufotuvotuja.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1ae0c2f0---96411263514.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dc392fe5843013bdd1eb16fe1fe8cf65/fusufomaziselori.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d78b2e6e3a7c28810f3549109653c96a/mugoganuzi.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ddaa310---81029149195.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/sibusolusalidas.pdf
    • http://sysquare.com/UserFiles/files/jozuvulozunasagezurema.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ac395703711bb8de7b6af133ad2b5c01/vepidudakokigum.pdf
    • https://ecoretras.com/file/43897814277.pdf
    • http://laduses.nl/image/file/jatipiku.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae70ddaa453---59878986359.pdf
    • https://aokman-drive.com/d/files/34719622453.pdf
    • http://qvault.ioThe
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=javascript+string+date+to+date
    • 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_off0000f02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
font_01_sfnt_off00010844.bin
80777ab3c8585a3a392c71fbdc322d3102d2c019d079a9e9e566f6ede51a651c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10700 bytes
font_02_sfnt_off000120bf.bin
e273235041e48c2a319f8e394aec3a2c4f92ecd4333077cd3c61f7d790a78157
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 17196 bytes