Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d6f6726025ed7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 20:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4b1158d9c5421703d8482a0ce979fa2 SHA-1: 7a311986e2988d67872125c77822500cc2d34638 SHA-256: 3f2d6f6726025ed7244c5a76d7714b35a2108aede4b10c481e02f8fb2e674858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users into clicking malicious links, likely leading to phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=death+worm+apk+full PDF link annotation
    • http://antwerp-reefer-tournament.be/argt/files/silewivugi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454975a05a6---22866702158.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/47444740463.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2fdb0fab71f8512c6dabd13c5272c7/vopuza.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/45804485326.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/06d7k1ks0ebm6l7i7e1h5beiv9/13769648599.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vekunikep.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614372995985a---59203599432.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/98760787909.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76708971786.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/pezegokotigigetajibazos.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021972115188655.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/rapapupuvazolisin.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/rakegidijemozik.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/78053572564.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/30475780152.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/12911218663.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/lekin.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3b4buflaua76h03ucmhb56p8gg/lapafevujoxelizunajafamiz.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914051356.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/29154020044.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_02_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10540 bytes
SHA-256: 46f734ff401faf1d6ccf8e4d761dc41b4673bc8360cd0d1da2f101ef4af6d7c0
font_03_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 16680 bytes
SHA-256: 2d725df2a3c3d91dfb6926524f172d94411f5c04f5bbcfe0685baf3e0d8d8847

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