Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab986ed64c3020a5…

MALICIOUS

PDF

62.3 KB Created: 2021-09-23 16:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c827572f4d692e5a915458a00f9c9620 SHA-1: 0f9625254595f3f127f5b0ebaa3cc801d8b2dedc SHA-256: ab986ed64c3020a5cd21d119f9cb4398afe9cd8188ec0155e3ffbbcd0cfa6e0a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Numerous embedded URLs point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9069

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+print+editable+pdf PDF link annotation
    • http://www.patriarca-batiment.com/ressource/site-image/files/58120267016.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/292sfkufpmrc6jabkiopdlaq7u/pupubufozipe.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/xixeziserakatasozixufutu.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/35788758453.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///45293803014.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161331b6879b4e---fujakefi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/30050075887.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/tojavikep.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3db1e978eaca98b81c6ce2cc7759c173/64648733912.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/31021473260.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jixutodokurat.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/rasudegatinulapibediwuv.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/mejizuka.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fef4a05d---somedalutetixepajutekelo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71ef656b6---91471802643.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/pazuk.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/zajolasade.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/24264628467.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zebesunakakolejipesezaj.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/sujaniviwuxavetupotimir.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/dibodupag.pdfIn PDF document text
    • http://araratmebel.ru/img/file/lisubutadusinob.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/22508850643.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/31763107863.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 17300 bytes
SHA-256: cfc3490076be71abfbd132c9210abf5652b420e4e5ec912b132a02d83898da26