Malicious PDF — malware analysis report

Static analysis result for SHA-256 e811f8f215fee41b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 02:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc83272e86657dc29b26906b79974fff SHA-1: af61a95c04bc35626eb2d1b5bac4b95ec9006736 SHA-256: e811f8f215fee41b3fb31764cad0cc8a702e174bb9979535a040c32978a70f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dehayemek.net/upload/ckfinder/files/54067617446.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f0dbf247a---bojisurikera.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/pipaget.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/sezaxazanesaxajajemovele.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/68010956376.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a4998ae9bee4a71b0540dba4a89ca7d2/tezinuxojaveluju.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/97990576592.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/92297278915.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2fb32d518d4ce27cbcf596d856a21e38/xisiligasoti.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/68941322574.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • http://garderoba.sk/images/_file/pukufurowidod.pdfIn PDF document text
    • http://unseretochter.com/images/file/51799666095.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070217544038.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/19615580590.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/kovofupadepafuperi.pdfIn PDF document text
    • https://aneri12.eu/res/file/93825947050.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28c22701d1c67bec9c8e33344d23138/55449233295.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0312c1a9d---rijopodevaposig.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/puzemonubij.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dab636aff---bedigukimativamomokesabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+conquest+of+new+spain+bernal+diaz+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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 11212 bytes
SHA-256: 42b41a9ca5965d0d2770c7c7d619a1b5eced1a7cd36afdb90356e08895aff61b
font_02_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 17456 bytes
SHA-256: 02c02edb0e663e8e2c738054a51094c053faba137fb802d39810721d10257447