Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5744837e406916…

MALICIOUS

PDF

82.4 KB Created: 2021-06-27 22:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27f213d11efff9d1374b87f04425d384 SHA-1: 360fcc8be4873ee3c4c4276838693cdea704442c SHA-256: 5c5744837e406916936a086e3e555aa451b9e7daf6740e8b46a914e994a9bcde
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c79339cf---jojapamarozesabebofen.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3cabe19a---voxaforuvizekad.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608effabc3a7f---gulakon.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f068ffbe7721abd8b6074a65a8170b1e/31092930853.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i4n7m8noggtv5bv6l8nmf35k40/28781622396.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a136d5ae8a4---ladamevez.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e8a4328da84f8e4f303a5cd6b38520/bakufu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff787af5f---pifobexepedubipifanejofen.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/n2k8pnj41nfkmguims78buj010/nolofu.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k6bkaajio7acnppv9cbc1kcnm6/22320951569.pdf
    • http://technoculture.cz/admin/upload/file/futikepupikotipotodiniv.pdf
    • http://techbis.pl/files/file/80665602951.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/40662030505.pdf
    • http://teplospectr.ru/images/files/sizanagamemuwaximala.pdf
    • http://jkbprivateiti.com/userfiles/file/mipasojijijanovijal.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/81f2bf29475a7aefea7754b8fbd1e694/69334125558.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cdaaafa1---65412828890.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e72ab41ac2e2a1be3c8f9674158e0493/bumomagewurelogiloj.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xipiduvefemufibefe.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gu028ul8mmff0rlq1fniacbspu/90421958838.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd378e2a91e10f48d435331dc5ff9739/70675560627.pdf
    • https://grupo-kayros.com/userfiles/file/jibev.pdf
    • http://phantasos.org/userfiles/file/ziniw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mease+countryside+visiting+hours
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 16792 bytes
font_01_sfnt_off0000f4e1.bin
ac77cb98bcf08c18857702fa27cc48f69144c5ad7f316133297eb9e663331dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 17252 bytes
font_02_sfnt_off000121ce.bin
e8a40d04a7b8aa21d2d2c7ac92a190632fa632257e8e9089ac98893c90aceedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 10876 bytes