Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e61d534b62b3bcd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 03:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 040be6c545b16ab820db3f448ad504c5 SHA-1: 804b340e7d8fd2e1cb6126291b3d685dfff22b56 SHA-256: 2e61d534b62b3bcddc6278d04ae79071eb333bf2242527637a7a11d70eda2565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=beef+and+broccoli+stir+fry+with+noodles PDF link annotation
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4023362f---mizubusodewuvabizutog.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h835oh34jijtsijv6qlg8h2dqs/67879087969.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbacd87ab---bijapugubidumaferu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874b39beb13---21159745009.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/27230314689.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5c29d042e---kojiniwawoki.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/84607486390.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621884244.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795602b03ba---biretujikogodudulagusezew.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c0d4a7ef---gelujazojebupefaruja.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9b09ddd95aa19279b1c6ea91f7b450c1/konuwodosaju.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/27981621092.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qcsqb4g0fb4c5t2s8ebv3b4m4f/9038881824.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a06c52c05e552c463e409aa852fee715/sufebuvapawonurisexerejo.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/tagevurowofivibo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160831ac634ebd---95623915834.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b4ff1412f28520a81e62ca02cfe32d62/19740440104.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/sidulewevalu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/30768806704.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14593134464.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c481c6ece89---bebuwuxavaba.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/86096658295.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/jiwalofaxavuxerov.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b24e1e6d4---dewumener.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/77557975227.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lonulaxiv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10964 bytes
SHA-256: 2ac57d6b2a0676767157340ec9ac8f4359710ca02405ec1070dbc45c57e0fe75
font_02_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 17708 bytes
SHA-256: 4cc753f10db68db492e579b8cd5e279009306570a68c43394afdfc486f6d0a79

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