Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b77fffd5880349…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b0186954072eeee74f2be5ac60785c3 SHA-1: ec1fe1eeee7c8bd24800738e6bf4017d8983470e SHA-256: 13b77fffd58803497b24684677e9ae350e4d5a706fcc7fd333aa224b534c3575
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=anker+soundcore+sport+air+manual PDF link annotation
    • http://marcelponjee.nl/ponjeefiles/file/xedemajatuzija.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07721abdfb---sobubupibelapadusal.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/73858330643.pdfIn PDF document text
    • http://watch62.ru/files/files/nutereridabododexaxaxom.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zides.pdfIn PDF document text
    • https://europartner2.pl/uploads/zamowodepu.pdfIn PDF document text
    • http://nature-revive.org/files/file/lijojog.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed3415380dce762250317a7d321f4204/dogitaf.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/zenisemo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160849ee46d75e---xubinogi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bc693348e3b275c6996252f893617405/vatez.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b66ecb770---74776045000.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607616cbe04bc---18854615838.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/betineseborej.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/56240035623.pdfIn PDF document text
    • https://wita.lt/images/files/22785910998.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27db189ab---94127325202.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeef776e06---jowoxinemipat.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/37512706323.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ef35a3bf---31848760513.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160795a9737e74---fesafawa.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/75134158355.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ba1caf45c---fomutonekudefelup.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/wapuxajuwexilawik.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/wusupajogosewivefuj.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/rodojusinuzuxidopozab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 10848 bytes
SHA-256: efc61e82308b3448c7caa13ef696f62eea6edd3361e36957a526529b8cb2d0b3
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 17020 bytes
SHA-256: 0466c78e2dcb20b20cc84ec9d931c13b3e0b193bc40cb448d3488e12276ae06d
font_02_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1