Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8a3c7621a61a3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 00:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3565413fa9c43165d184d5477a98eea SHA-1: 485c8629ca29bcd2d47335f478597369d572ee6c SHA-256: 3ce8a3c7621a61a3a2fb3a40a594e216fede289e88af489e0bec6ff0143d4198
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a screenshot image designed to deceive users into clicking embedded links, which point to compromised WordPress sites and other domains. The presence of multiple external URIs and the structure of the PDF suggest it is part of a link farm intended to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1be4bcd2253695e7e5c3ae024946f6cf/24444553686.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/69948031051.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ab05ffff4672d3d1bb05b752ecc8673f/77952007625.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/32813967775.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sinowu.pdf
    • http://krakowska98.com/zdjecia/fck/file/fapivadita.pdf
    • http://getdol.com/page_data/file/munigere.pdf
    • http://dungcumaymoc.com/Images_upload/files/vifegasopugugotufazinawuw.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/dixogadofip.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150e693050af---tinuxewowopuwejetumejapu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4ab249c977f20981c0eb6a7ab0489749/voreg.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/midepiwurig.pdf
    • http://only-svet.ru/upload/files/vorusexafugag.pdf
    • https://remont-bez-zabot.ru/files/file/96980256924.pdf
    • http://caratow.nl/userfiles/file/36877873820.pdf
    • http://advocaatindex.nl/images/uploads/78113646672.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pijumivel.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kff1ulbjgdclm5m52984mfgmj5/fazilovepidadilanobawusib.pdf
    • https://hinodecoder.com/userfiles/file/vubolapivuwef.pdf
    • http://purofirstli.com/userfiles/files/10687578393.pdf
    • http://ylgems.com/file_media/file_image/file/55055713553.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+open+mp3+on+android
    • 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_off0000ae33.bin
dc1f00b622b06691ed2cf4dc89288467b183ca179ae91954481c18c5c86f0d22
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 13784 bytes
font_01_sfnt_off0000d022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16792 bytes
font_02_sfnt_off0000e839.bin
8de6520dc095b992ac8d2ce58ea47e36624c782a0c58a121ce6f353ea72c6069
pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10588 bytes