Malicious PDF — malware analysis report

Static analysis result for SHA-256 992a61c0cb64b975…

MALICIOUS

PDF

80.4 KB Created: 2021-08-13 02:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c25a5ae842cf80d83c935c913f980b7 SHA-1: 249767940a24f473037587ba0ac8e2976f11e76b SHA-256: 992a61c0cb64b975604abc961be8385f3cd4d40be68a04ed910a96e71cf2517c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266f61a333---71002536521.pdf In PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/kewusotatudokitefu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/43929020566.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1mlt4a7hpp890k0jo80495ou1q/9101647499.pdfIn PDF document text
    • https://hse.tw/upload/file/24383189678.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fd43e893619---fagitexinox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d806e422de8---guwifodebevax.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210728090148.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eee6b91da0624ade1973bfbe7048707d/lojak.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874eb9ae48e---xezar.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/bulonutafafisobuxiza.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210527_38B79DB35BA62932.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/49041302699.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b92237dd40ac6ff0ed87a27b2fbf4e5/ziweral.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/lurodeji.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/3882460436.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e9abc1f0e8d9b518f8179f7eecb34ea1/numawimupiteluperomufiv.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/tagukawebunekamejonorimod.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/99977504693.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f26ac73a---vovumenomi.pdfIn PDF document text
    • http://etnorom.hu/pictures/70044096383.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/afpif4kmljnp39mc5d4eql0h52/92530596823.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/jibuladiwatujuviroloselif.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160937a5bc2ec9---78333837474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+generation+is+intel+core+i3+540PDF 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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 17888 bytes
SHA-256: 9ba3b3412a2d00d141ddcf8f087f644af02ca5c255f37cea390e53a910a39933
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 11008 bytes
SHA-256: b09a21436b32eb5af76ff2f6dc28e0c7cb70173d970709a4fcb1b3787d797e07

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