Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8fc72d722a4ae…

MALICIOUS

PDF

81.4 KB Created: 2021-07-03 04:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee7a4a78fdcb57b76788b494ba6192e0 SHA-1: fb09fe5a355b85b246348174d3a923ab65621c45 SHA-256: bcf8fc72d722a4aefad0c5c5eeabbeb9e5e84cda7e69e74337a8b2bc652eb6af
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medica-eg.com/userfiles/file/66015084521.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1987199863---13177954977.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fea886add9---dasat.pdf
    • https://malashealthcare.com/userfiles/files/zepimudifemodivig.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc56d618e1---porulowemo.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gb0694l48qlafpl83ituhpff4e/jidagilavulipuva.pdf
    • https://cecprint.com/images/file/36222089588.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090803601916---xozededopasiwukalifubonut.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a48e2c31d3bd32f414c2cc0ea0e6a8c0/77082202510.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6a132af2b2e69927ece187c5e23f5a27/66330224174.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ieg773gppg02liqhl24dn7b0s3/53462346762.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4004f98c2e---42511241205.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4ef45c4e07599b6ca88268dbf8997cee/nolewa.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bd0426822a686a8b7b5cf505bda13971/suferanodupugona.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ed78e17a---46160304397.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/dabevepamofopo.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc16ed477---gajanogu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f806dcfcce0ad4af6fafa51970677c0c/senulasavorakoragopin.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/85b6614a5b9c70ffc93edbd89585f4f2/94621040308.pdf
    • https://pharmnet.cz/ckfiles/files/files/74979911766.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/90221088538.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/kixadovof.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df57aaea309---19884309285.pdf
    • http://agiusfuneraldirectors.com/files/file/rakozunutali.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0djsscdppq25p88ijr4qjjjlkc/1493644480.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+import+a+pdf+into+final+draft
    • 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_off0000dd05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
font_01_sfnt_off0000f51c.bin
945bd470fb096036fcaa7dacd44ef58fd9b40ad14f8272ea7c381a335ad6f247
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10604 bytes
font_02_sfnt_off00010d4a.bin
d3ad984435442ce233e82995ce8ecd392bd6d9c73680c8652cb6d0b103d8f842
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16496 bytes