Malicious PDF — malware analysis report

Static analysis result for SHA-256 b914e2ea599fc49d…

MALICIOUS

PDF

94.9 KB Created: 2021-06-26 09:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6533581bd98187314040d94f452ecc89 SHA-1: 8251bb1dd2e7f708a31c3b381e4271555fa450ee SHA-256: b914e2ea599fc49d9e2d0021480a1719cae81f99c4ae69ce6738c19015290159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca1b308a7---jezajelaxe.pdf
    • http://zge-led.com/luodan/images/userfiles/file/rezoxuduwikiwokil.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suekatatvkftlrgsb4tbulos27/86832424085.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8c78b136b3291c42e3ca03f8ebc4d321/lesak.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0ad9a143---6840519975.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3ba46c3dffecc30baed03cbab9de47a6/goniwevafeduvexogijuzoz.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3307a965f6---zawiwo.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2fac0e44---34803420862.pdf
    • http://alexlunacoach.com/img/editor/file/simidavepoge.pdf
    • http://ahcxdq.com/uploads/file/280251412928.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a30a3091c---79262913311.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ed4ee40be---rezubezedivifizonu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b05c982e---zevej.pdf
    • http://giftboxvietthuy.com/upload/ck/files/gisowulevokalidu.pdf
    • http://reclameindex.nl/images/uploads/39795435223.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ttlmgpua1mmim7bojo9ngka8t7/nikuxewo.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb6060413---96228925357.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/03ff73feb11a39cdaabe65838119ded6/jikepatudojupoba.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc47101571---48478802231.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2109a9facd67fd0a8751ca4f05e38a10/rebapovadovu.pdf
    • http://poltinik.ru/userfiles/file/72031746316.pdf
    • https://numen-wow.com/userfiles/cloud//files/pavuzexenojuginugodupukes.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kn35fqg82hpuge48d6hard8cu1/robezopuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=i+want+to+praise+the+lord
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef92.bin
b39178611dc4bc78bcf3ea73d8ed5450cf46eeeefec105c5c42b1d35d5b41965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 17224 bytes
font_01_sfnt_off0001092c.bin
a3d3fdfd352f2cc971938135e31b37f775a8dc9c7d7aa86ab8dd8a9609141f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 10528 bytes
font_02_sfnt_off00012116.bin
bca201143fb36631e6d161232355d12a7969178e4fc3a9fa64c53bff92539c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 20544 bytes
font_03_sfnt_off00015469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 16792 bytes

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