Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93a15422507cbc5…

MALICIOUS

PDF

79.0 KB Created: 2021-07-14 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58094dec3a3557294e018584929bb618 SHA-1: dcc63e58313027276d40cbdbe09cf8eef1aa76cd SHA-256: c93a15422507cbc505be55e41a8a8ae4691c96b3ab86f98bb6d6b5780cd16120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1fc29eb0---75446612267.pdf
    • http://studiotrusso.it/userfiles/files/11828428758.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaa08ad54---vinaxesuduzibabozusubakeg.pdf
    • https://maintogelonline.info/contents//files/nopotukabukojedejidowefij.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4216772e90---62370292662.pdf
    • https://nhorizontours.com/userfiles/files/warudidesisox.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/27a1re5r1l9smo7nbh75vkqog4/52839767587.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47864cbff---25124641826.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea2107c00---23274108118.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160837b10009cb---82407574153.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/gakojuzidokugidujokazaved.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5231c2658---58430771791.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b2c6aeae34e56fb5607bd465892c01c1/vefebowupekasosuzape.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92f6ee936010abde7557a3dab2e20f34/52981007728.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nowanoxixeguniniwiv.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/60fa4743a01ba4e39fe964cd3fb1c96b/69773946808.pdf
    • https://eyetracking.pl/userfiles/file/11301703672.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/qkhkp09bftfj18qsu5te4htduf/6673813052.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b95f934a911---fitubajenenodo.pdf
    • http://red-persimmons.com/upfiles/editor/files/26189367733.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/11b9e3f5892079a16306e27bc84c37aa/pudirifimozosa.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/70386419836.pdf
    • http://alphasigmaoverseas.com/userfiles/file/79694679282.pdf
    • http://cvsc.co/userfiles/file/81809306202.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+stained+clay+in+minecraft
    • http://e1pl2.nazwa.pl/busy/fotki/file/geretejemiwizajozukipu.pdf
    • 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_off0000d052.bin
b143a45dc44a90ee1edaade58daca57f6f670a45159cc2a7a87fc3fcdb18aacf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 17036 bytes
font_01_sfnt_off0000fd31.bin
e9b7b5eb23a69c1bb4f9aea7c3104e21144baad06254be0d92cececba5b73297
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10920 bytes
font_02_sfnt_off00011680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 16792 bytes