Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14f752d3cc8a945…

MALICIOUS

PDF

82.4 KB Created: 2021-08-16 22:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a358dab965ad3432d7fba102e8d6b82 SHA-1: b0024f4f7505634024f36b8defc8730eaeeaea5d SHA-256: d14f752d3cc8a945ab96016ebdbd61927b626aff40d3ef7be3206dd5d1351c37
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs, despite one being marked benign, are part of a pattern designed to direct users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ost7flq8pe4moeqtejj85cjou7/lelilofotomajodubilep.pdf
    • http://atek-ent.com/upload/file/xemet.pdf
    • http://ansing.nl/userfiles/file/31414740798.pdf
    • http://voxel-avocats.fr/uploads/file/89049049390.pdf
    • http://iamsong.vn/uploads/files/49211833384.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160881a5f30243---pozuli.pdf
    • http://yjsyrj.com/userfiles/file/81519573675.pdf
    • http://www.urbanwaterways.info/files/mazetudoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a004e5d507e---wotuxewotudesuvalir.pdf
    • http://tcihk.com/userfiles/14876574367.pdf
    • http://sys-svinding.dk/userfiles/file/lafimo.pdf
    • http://fzcce.com/aimgs/uload/files/saxaxarezitikogajavubas.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/17243961249.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aba00551dc7---dajigudiwumiledo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608798b39a90d---jutovusupemajojalajome.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed74a3780ea---vakizapumuted.pdf
    • http://dahchen.tw/userfiles/file/36291968543.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ls4enn7bf4ha8r4atqrgjn3ms6/48823443678.pdf
    • http://amuseonline.com/absite/userfiles/file/15190318904.pdf
    • http://www.motionmantra.com/userfiles/files/fafomafefejavatuxewawusoz.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa06d21c0---bukaboxisefezam.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/8krbm312k8uje6hjgn0rdq20sv/13283596788.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sparkle+2012+full+movie+online+free
    • 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_off0000dd8a.bin
e2ae84fffee2edeeef0b9782d2d09c2a31208f1420a5ae9b814544c7dc4b94b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16580 bytes
font_01_sfnt_off000107f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes
font_02_sfnt_off00012010.bin
d13e6c0aaae92660ec74c8f09717572e73b54edb24538c37306a64e33b61b45d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10880 bytes