Malicious PDF — malware analysis report

Static analysis result for SHA-256 283e321a276aacdb…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 06:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11da0caeecd77e0e627b75a703965b29 SHA-1: f4b03104f951372e0a6188edc0dd8982b44cf5c4 SHA-256: 283e321a276aacdbeaad8f79a7852f47b65b9ef9e4f99a0c35ba5806687f6b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://soles2walk.cz/data/file/godososevorosojizozizaw.pdf In PDF document text
    • https://dynasty888.com/image/files/20210604_112752.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/rasuve.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/zugapekilopatupikof.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/74923870978.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/wiwogixekuposilawevojekub.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/27447251456.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea003aef7a---murokojazovurazezup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ef69d1e2---fogipikepeposexadurer.pdfIn PDF document text
    • http://saptpadi.com/files/file/majanez.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wawexed.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/34647489866.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/je62imteo6q788ce3d02bur54o/tawisega.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7c2b7b96---90488262426.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/65795a0509ee7fbb59fe40945d8c0c13/80360704562.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/mosixavumugepulukuk.pdfIn PDF document text
    • https://magerp.org/upload/files/68726299789.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/00i22anqnp218d9psha7fgjgvv/rofufisaxanosiwun.pdfIn PDF document text
    • http://roocenter.ru/upload/file/81615973092.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/21089291101.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/79d6aed5adb44415686ff565c69a60d1/pogajide.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/likol.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/belesov.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/60833115850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+are+good+sales+incentivesPDF 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_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 10708 bytes
SHA-256: f0d1256088754e0b3835c427e4233dedd971d6e00c82396201cc78c1b7ad9507
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 17236 bytes
SHA-256: f2f70bc237619d5cc2672f893498ac3212591f4648f5777e72d5e304506f2fd4
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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