Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d20b7c37ecdca9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 02:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 234367badfbf56af834448edb37bf82d SHA-1: 1f87918494239d3d1a5607e0c33ca4bb478994ba SHA-256: f2d20b7c37ecdca958dcf17d698f3c5544961d4ab0230182fd629020632ef8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URIs, many pointing to disposable hosting or compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate it's likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=video+locker+apk+free+download PDF link annotation
    • https://sergeca.com.ve/ckfinder/userfiles/files/devorita.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/petusa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/62c20a113f06f53f1aadea030547e963/77679146694.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/77630350223.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/naperowodovuwavijikaku.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613104aa0c2ac---12640754379.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f12e0de6bb---70405018772.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/48397076993.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/91302847574.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/79654501507.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0137adff---42158884541.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nadituzidasaxetojuwa.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/28978588727.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/84527483794.pdfIn PDF document text
    • http://laduses.nl/image/file/weximibugemerudepixute.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/40386360620.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jetgpvoi0ffdo6j1gt02ja0crn/nanamurolekolesusuluvipex.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa08912765---99491031318.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/gijovagafenijogogekuziju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a7e4fa34a41a728cd4f876e4c9453bdc/vamisogixixujelije.pdfIn PDF document text
    • http://ty-int.com/files/files/91184748416.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/7908834404.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/moxotunojuratesifatetiveb.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210914093636_uc49ex.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/59307314243.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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 10496 bytes
SHA-256: c79eec00463c43cf5fec5cc8d3f9c82317ba74af8b339849867ee30949287d85
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 18288 bytes
SHA-256: 6c34e537d4fa004d67bcf5fe90d41ddd5734cd38f0af828580f2d69c2ef15f5e

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