Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94781fbb7b92cc4…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 09:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 016cd4af71f1900b42187a8397efe2ad SHA-1: 80b4c880b994b5b44d99b5b51787b92a5bc8d60f SHA-256: c94781fbb7b92cc436a3df7e9a220a24b64855a7429dd5092111642c8ef8aed5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://writtenmail.com/upload_images/file/bomilaxatur.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-20/20210620195614919486.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq23bg2q9hsvqecgq0rouqenre/79795949274.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7852fa0dc4955356fe1790d38ebf6c2d/19934338261.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e256ebbf839---raseposulaz.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v3sd0l8vho5222nrc7l1c6atv4/31390459927.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4138027cce18bb29259fb957f02a4752/93398466374.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c51116703---kerifazobaxetebeduxela.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7a152119fe17ce431243ba3026b6c61/35241510823.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af415a291---68607787465.pdf
    • https://bataretak.com/img/files/file/botejusidulokovofozi.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085053fe6f28---xinovetefifowu.pdf
    • https://henklinders.nl/henklinders/upload/files/8081032450.pdf
    • http://aelma.com/sites/default/userfiles/file/19560652876.pdf
    • http://hdurmuslar.com/images_upload/files/39253976527.pdf
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdf
    • http://bpsstudio.hu/uploads/73509241447.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094920da66f4---taranifa.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d1be8a41b7597e7134b422b6cbe335e/77686371253.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/tivon.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9ae72da1---mexowuwixuvinud.pdf
    • http://goldnumber.info/userfiles/file/75392032544.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jeremiah+prophecy+about+the+messiah
    • 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_off0000e62f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
font_01_sfnt_off0000fe46.bin
26e6bc7b90056d5aabc480ae66eed23a58147083de00a885c47505e213e68e16
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10832 bytes
font_02_sfnt_off0001171c.bin
ae69ad882cd98553a605226d1f679711c2b0d7deee4c1767fb1b16a02fe213d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16968 bytes