Malicious PDF — malware analysis report

Static analysis result for SHA-256 6868c0fd321526d1…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 20:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dec2b51da49e6bf715495e20ad56e38 SHA-1: 6596a1ca13d813b2f15d605c95991c235774b8f3 SHA-256: 6868c0fd321526d1d81b3d0b350e5e83ec931eb0782cfb129521ccc85cf28db6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely phishing or malware delivery. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://wastran.ru/uplcv?utm_term=throw+it+away+meaning
    • http://travelshops.pl/userfiles/file/41973265855.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/25061347009.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6134351eca---xuwalufebotamipumot.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9d2da4e6---katokinewikidobatowupo.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ebb7313d---lenofuwexugobes.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec388b3bf---wezapadejefititiwexa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16080d32b68fad---revad.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/23794687700.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd39060b8---26615349500.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609894b010232---fasirugukiwosulozusisol.pdf
    • http://dianacb.cz/userfiles/file/jutazusadiwovadomojin.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1onfiisnj65m72ossckrggima5/18822764926.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f940c31cc---guwajoxosexapes.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/t1b8386mif07ikdpholdd2rmb7/jazuti.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b90fd1631---kumeverafetoxudibagubid.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaa01239b---mujovi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ce78219b---89659272774.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/993b7844c80cfafe89038558f53a906f/59308870898.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad442c7cc---kepidipimanubulupovu.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/52aa5c0546f4b7d1746dd0045ae31542/75869542493.pdf
    • https://campermagazine.tv/public/file/53261425726.pdf
    • https://alice-immo.com/userfiles/file/29943969345.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_off0000f1a1.bin
9fb0adfef1d388f282e2363a7f0c484f52cace1b710df2f3505769b7b3b95117
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10504 bytes
font_01_sfnt_off00010971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
font_02_sfnt_off00012183.bin
5c00e1c861e88a58d3dec8cc46d357c454a84484390c742f418640b3db7b05b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 17280 bytes