Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ef5ab3b6edbe30…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 08:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 316a6ea5f7faa82265353de225a93871 SHA-1: 9855cf5dc4b56241b7720fe6a71a090e1227b0fa SHA-256: 25ef5ab3b6edbe30bedce3a021e7d497992935cc810a169a5c5251ea3e98d920
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, including a PDF hosted on a compromised WordPress upload directory. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to direct users to malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m3hnl5ktjc4h9b9pkstshue6s/buwekos.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503232407123797.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5b472435ec812d9e96828955770cc404/96334932800.pdf
    • http://verynailscm.com/user_img/file/pavozosoposalofosematu.pdf
    • https://www.avantagesapp.com/uploads/files/wunigolofanolulazetew.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/99433733307.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/81233296408.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a703c2d6b5e---33211943339.pdf
    • http://kencert.vn/uploads/image/files/24274555548.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddba74468---nazumabavafom.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7842ac923---fuvisojefofunefav.pdf
    • http://gourmethousemacau.com/UploadFilesfile///barewukimurot.pdf
    • http://dellalontra.it/userfiles/files/sijizujowapenovanumok.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0457bb1802---lunixener.pdf
    • http://smepil.com/ckeditor/userfiles/files/38267741785.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfe11ffed---didejilivexilawonoveli.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070850a5ea0e---36808488143.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bad04d634---64522187704.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d0c7a5d---vuxibux.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/51754535194.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/94260258633.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f06e8f6251661ccb683ca8dbb5c49c29/93927896540.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49a6193de---74768586039.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fbc690e2841c0a5f1a2dab37e069e989/77512903924.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ih7r5l8sbhk2hd1sj2jdefo4kv/debugavujixakewiniruzuk.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2623a3a7a---35974579050.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=passion+fruit+health+benefits
    • 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_off0000f636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
font_01_sfnt_off00010e4d.bin
8df112a8a51adc9d66399d62018cb6e5742468b9a2003f5c003e201ab86ba87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10552 bytes
font_02_sfnt_off00012652.bin
261049128f96b3349d422237d22ce544d0f95cfc27a15c29d0281b6c6d3c1492
pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 17476 bytes