Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ed490e1105ca4b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c15c14898eea413f0affe8a217a4aa72 SHA-1: b136ccbf5c053c124f3dfef594445b6905ddb534 SHA-256: a2ed490e1105ca4b8497dd2697331493e73aed913aa318e538983b98edd51da8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://fc-junajted.com/upload/datoteke/5290336370.pdf In PDF document text
    • https://hasekei.jp/userfiles/file/19143986934.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/056861aa27ba784dd0ad01a2a9b8dd43/38999115633.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e93a67894---27786627540.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47049315295.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/begujese.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/libatutetidakaganore.pdfIn PDF document text
    • https://loyd.rs/images/file/89069330078.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bojujonijurumax.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zuzelebeguliledep.pdfIn PDF document text
    • https://elemonbg.com/Files/File/jibiw.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/30079538370.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c207a4e85---seserubul.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/navudijo.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/lirewegavomixi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6501daaa3f8dece94720ff8c26410694/vusakejokoj.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/tewinevuxofiruravigezela.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d7efc29b19540c31ba829d591ae7de50/4270655043.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/zejanizemazopakoku.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/52416333856.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/gujefugagele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+widgets+on+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/zubemepupisaja.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 18316 bytes
SHA-256: a4e0763932fc8945a18db09cd4bbe9c8d915714e07306d130178a6fca91f46e6
font_01_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10500 bytes
SHA-256: c2fb85668b04a4eada75fbf9e378bc3d493d0521c72a63f484687d616b38de8c
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1