Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63affe9afb48b10…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 00:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f426cf483552cea946c3dabec924d75d SHA-1: 9db617bdc08c47e6d605c02716dfa99828bfcb6b SHA-256: d63affe9afb48b101344be9f2306f7a9f43fa7749c41d9a3ff7f61574830902b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking links hosted on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=cognos+training+material+pdf PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d2855c41595---66437362233.pdfIn PDF document text
    • http://etnorom.hu/pictures/tanukidixevutulazixujotus.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/pubaxijizutenedefanen.pdfIn PDF document text
    • https://t2sc.me/userfiles/1389614134.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xevelavirotodalu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16135b3518def9---pulavitowef.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wifutuzoxu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7a73e920edf3c02f34bf90561e452941/xivemisimos.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xamijalojolifuxipabe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/kunmaq4h61mf2c5mtna6p0899s/82384309535.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c08529d055e---55778195131.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/35280916616.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825392e3eea---kaxaneguwisub.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/80fque28gu3a2o22jdfbq9q306/xupeferibelejeketunew.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/37276256789.pdfIn PDF document text
    • https://paradigma.bg/uf/file/20389525893.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da07cc1f8b---guparakejubidekonate.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0a591f1e6b097ff737024cdbdcc55c3d/32985722997.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11252612105.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/66200180679.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wenet.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2cccc9b5d0f3e895aa0d863ba1defacc/78710887747.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/paralovuba.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9df8lpjnp1saoaigcdqbso2hvl/fidinisotikarobiregudebed.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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 17148 bytes
SHA-256: 9991d2a369648a46d744e41b6fa758a8bd968d1475f25634041aeb534c956561
font_01_sfnt_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 10872 bytes
SHA-256: a93d7d5bda6d7d265acb0f814a2159d3eef8eb8f8115f9fbef9073a97e634eb9
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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