Malicious PDF — malware analysis report

Static analysis result for SHA-256 5905b17d5907c5f8…

MALICIOUS

PDF

58.2 KB Created: 2021-09-26 22:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89dd82f032da24123d3356fed33a65df SHA-1: 1e1675805bfe86040832b3c895e3afd1b8ba8a5e SHA-256: 5905b17d5907c5f80536f0d4aed00698a3cc311a851f8495c919ff8ed707843f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only nature and embedded links. The document directs users to multiple external URLs, some hosted on compromised WordPress sites, which likely serve as landing pages for further malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 58 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=attack+on+titan+aot+offline+multiplayer+apk PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614a36797bd99---miwobawepimiroronobidigas.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/82204648926.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/14843971640.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/71411175087.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/90340492804.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/72754556740.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/rusewoxutufewapirebubijep.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vamasodude.pdfIn PDF document text
    • http://prmakeup.com/Image/files/porexivifixoref.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/53828149716.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161483fe264f77---wavepusitexewidu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wifijexikukab.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xoxasafo.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xobatok.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tusijijugos.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/71067005086.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/89553917210.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4ddf7cb5c0e24009c0c419a2c70bfa0a/70447074194.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141449eac7f8---30808365980.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/febaxexovetejujuvubufukiw.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/13710739423.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/34106826968.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/putisufasotaboma.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/39954128915.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 10760 bytes
SHA-256: f0fad5035819ee54690bde5c9f406688d54ac70baf7934a9e3371cbab59688ef
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1