Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acc3120b0b22ed3…

MALICIOUS

PDF

194.1 KB Created: 2021-07-13 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2696d795fc9d881456e5ddb11372f4c SHA-1: 55fa3fe8c27f2384092fa28fc9455e28e9fcce49 SHA-256: 8acc3120b0b22ed3f835b7c4c6f2fa0f7e503bc352453f94ccf38004f6d1b64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2mpmmvb6m2j8otnl18kun2ngd7/70568812657.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2418101b0e5dd72f0cfdb65b64dd2eda/sozolimasogosofenozisases.pdf
    • http://illinoislivestock.org/userfiles/file/49259650148.pdf
    • http://andlupa.com/userfiles/file/74160420009.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/44e954906c0e635b84c0c268d6a6e668/42932847415.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c841efdf40ddec82eeebb2e63b0fa57/niliduruxesuwejozo.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/65813700730.pdf
    • http://fotomil.pl/ckfinder/userfiles/files/wunugifu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38d03040e---zawiwupe.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e60a5a7e937---95802446369.pdf
    • http://retailcop.ca/files/kovezilitolosonovujugi.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/vijow.pdf
    • http://banghetretruc.com/media/ftp/file/bupavenageneminiwatif.pdf
    • http://writtenmail.com/upload_images/file/55636271045.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/95155955380.pdf
    • http://secretinvitation.net/images/files/33950286743.pdf
    • http://border-inn.com/CKEdit/upload/files/rimulizineridezuxamekugut.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f87328d1b---46957131444.pdf
    • http://aite-materials.com/upfiles/file/37212826566.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e32eee0994e8fafddb88af48dd7cffda/jirakegodipa.pdf
    • https://ingmarcomantovani.it/file/bevesufamufuwuroneser.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4b82c987cbfd30cc7b1a1da28aebb7ea/zurotomutojulagulukowedo.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77eda54b9---lorukofofopu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+witcher+3+skellige+deck+build
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fe30e1fd4be530291993137b061aaf7c/zelajoxo.pdf
    • 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_off00029751.bin
216543e3b37e87f0e7f69f205afb0c43e13faa2f9a6b211044588815c8c09d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x29751 10816 bytes
font_01_sfnt_off0002b054.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B054 16792 bytes
font_02_sfnt_off0002c866.bin
2815c0597c04dce38cf08aecbfa70d2bad3ec50b481904a3ef81eeeeac4bf04f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C866 18900 bytes