Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbd42ce2e1bc873…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 15:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc1fb3f7e7f78efecaa5286a279cef01 SHA-1: c406a647084803e89d72db7cc8d582f688c24ab0 SHA-256: ffbd42ce2e1bc873b1f88cb7d1f48edf64d2a554d72f8c3a50c05cd94c7d069f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://minipowerpack.net/upload/files/38228375374.pdf
    • http://sinojjacob.com/userfiles/file/ninorolofapiw.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/8714432986.pdf
    • http://westernstudioservice.com/admin/userfiles/file/dakipobatifirija.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136800a8c193---temiwovuwikakubojekupego.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7ae483cbf---danaxinikesila.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613170b80ca8c---razukesumabatu.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f07737298e510b76c05e36e10e76d8c/tibuje.pdf
    • http://capableapp.com/uploads/files/59132591894.pdf
    • https://southernwashpros.com/nbloom/fckuploads/file/75359249474.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/34516911815.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ea822e32---91422696532.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/tikixajajajejugoge.pdf
    • https://discovercefalu.it/_data/images/file/tokojobejurufuzori.pdf
    • http://rund-sro.cz/UserFiles/File/50635129345.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/paxapuvegojowanetedis.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/32162663748.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa15e8bc28---25652238821.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163111969763.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i2v8h1tht78gagbu4h347eh127/fuzoveduro.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/wulesave.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091323542873499.pdf
    • http://cuacuonductudong.com/upload/files/46061780752.pdf
    • https://kettosallampolgarsag.net/imagini_ws/sapanevifabonewetubeve.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/wurudutesujipasazupi.pdf
    • http://sutipatika.hu/userfiles/files/desosegiwizuwokugutepigiz.pdf
    • http://cmtsport.com/pliki/21778468609.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=x+icon+changer+mod+apk
    • 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_off0000b89c.bin
2b239c2a20023995d63401d7f422386d10680ce7a1e2c339c274ef9e4a2c9214
pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 16296 bytes
font_01_sfnt_off0000e1cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
font_02_sfnt_off0000f9e4.bin
a2d7daeda8eb8af2e411db1ad5d3a5a97774273258e8a8262af91617fb6c617f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10748 bytes