Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25cb90dca997615…

MALICIOUS

PDF

118.0 KB Created: 2021-06-25 14:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e48e779a8c18303040071cfb57234381 SHA-1: 1ce7a74306dd1afc1b6f40ea0812047ddf9372ed SHA-256: e25cb90dca997615ce1b16e4836916337c9c5e86f3ab57fe4be708476d756e04
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kfi8u1ug5al2dp54gkc5rqtkt3/xolinarenefokifaroteguzo.pdf
    • https://sca-kc.net/scauserfiles/files/44887996161.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/42536641164.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/64646997872.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/gegozojepaniwekidoxefa.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d364cc00df---gupada.pdf
    • https://alexandrapanayotou.com/web/images/static/file/wojelarorodise.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pisipuzit.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb3b29abd---magakunoxuxeku.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/555ee67c1541405b7d11112cbcd5af33/66159678582.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780378bb9a6---11476688116.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fdf6d41204d55f1b1fdde814c010d636/zufanefufudirezomurape.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/bexetavevaguxob.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/28154058103.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2fc6757c---gokevewon.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/93a541b1f3f22e8e8a8730bc03eae0a8/jezezexerisigezove.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=while+in+tagalog
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bd1.bin
eb817e0b37e21202870d52f429b8cbde512ac0c83284e26e7a8533b264bbbb70
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD1 19344 bytes
font_01_sfnt_off00017d6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6F 16792 bytes
font_02_sfnt_off00019580.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x19580 16244 bytes
font_03_sfnt_off0001ab63.bin
f1a1d9b47b5eee2fade882070c3332651c81c60b8e604f9a9b670748226e5382
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB63 1908 bytes
font_04_sfnt_off0001b432.bin
abda5a5659a70aeb93a70456e36fdaa0fdf94ac69eab41d3d7035a24509dfaa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B432 10112 bytes