Malicious PDF — malware analysis report

Static analysis result for SHA-256 569b396c7ac2d003…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 16:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfdad525c9de8f9cef31fc32d8b7a6ba SHA-1: 551bf945b545f67eb3804d81ccbfc4aa15bf0822 SHA-256: 569b396c7ac2d0032346c4fda4e1e07e32d54827c24c73d4668e98e736bafb47
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to redirect users to phishing sites or download further malicious content. The presence of multiple compromised CMS upload links and disposable hosting indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc52a24b0---22275294521.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5c5c550932c7f9fcef47d32c7f560b85/66591783274.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/lokutiguvuvipavarezimafo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/fujosikefavevibepirasapo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6130AFE4A0556.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/96476740699.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/44823015680.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/nexomapedifirivosinoverib.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/zubemonojewufuzujexefel.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/besiwe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137df0d98f04---10705659524.pdfIn PDF document text
    • http://aromata.ru/upload/files/3993874829.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/fowikuvuje.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/6646059897.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb8e6615c6b7441ff58b2543977328de/rabuwarosapikivevuz.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/14421523649.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tiwamorar.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/13284677317.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/34594060256.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/fajinobegasusomorolado.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gosudabumelelusam.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/nexipodosulenomasafak.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394dbc08a95---vapokekibuzotudamisumase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=after+we+fell+free+online+moviePDF link annotation
    • 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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 17488 bytes
SHA-256: bb5c9270f246fb594fa86309434ce05073227239255a296ad1b2626441e4750d
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 10180 bytes
SHA-256: 59dacc855025f62edb44983700e021ec0b55e24754b3508551177e286858b5ea
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1