Malicious PDF — malware analysis report

Static analysis result for SHA-256 b340061890bbe80b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 17:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47b130bfa87212a907385b415c6b6954 SHA-1: 1f7efa77cbc3a9c7df6085920ee1c85ff18cad3d SHA-256: b340061890bbe80b166c47b8b640aad9929b446771fb09a7aa5e48ab8f7a5da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2356a5b89d---26133655842.pdf In PDF document text
    • https://stopserv.ru/files/file/vakejenane.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63dab8f6b---76652012277.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f31012451---vopifaminifetifiwud.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/44596290637.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/simutajil.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161296bbaec215---68474502771.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6bd972bfb92a46e471c1ce44917e4822/8161547522.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/09d7b9a5bb78cd08bba42cf62159a2ee/jarexerup.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/n3el60n82sffvhvfpgt22um1qb/javigewijutirazixugapol.pdfIn PDF document text
    • http://falerisztika.hu/tmp/befukirajibusejusoraviti.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/37968480477.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/12711275934.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c10e3bed---98051410632.pdfIn PDF document text
    • http://df-foundry.net/d/files/ritimefiwutunanepuzabo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8881047721.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/pexibaluzibekodu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857a02a5e3d---gerul.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/79014413076.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a03e5b5cf---witaluvuwaleloxuv.pdfIn PDF document text
    • http://angkagenap.com/contents//files/27069553997.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/doburazizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=noble+eightfold+path+pdfPDF link annotation
    • 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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17816 bytes
SHA-256: f1cf1c5e56b79d081e889643403aaac6f3113b5622b1cfcf9357fe0d382526c7
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 10520 bytes
SHA-256: f14cab438c1a0a2c735e7d395e01ed029e2ece304e147174338304bf3e9cd354
font_02_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1