Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cc9df17385ff4f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 14:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 330ff4741cb682307e01510f0db9f50b SHA-1: b8a7e66617871ffe0426483e8ee61783ef8cd754 SHA-256: c8cc9df17385ff4f4dbc5f0098bb0310fbb15041419b8b7bc953bf116ed722fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics suggests a deliberate effort to obscure the final destination and evade detection.

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://www.logistiekverbeteren.nl/ckfinder/userfiles/files/50313661087.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3f74fe8c557f971492754b686c7e0d6a/88042039631.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a0ada3e7---norexubarijumewazivobipiz.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/47480060216.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/673206348.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/80958422219.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/bifipeki.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210716_C5A22078E34CF47E.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/95cc484540b8d808f5eb673c482ab202/95568456552.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/2735546960.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/nubugobek.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wirobujipuligizoxam.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602002100.pdfIn PDF document text
    • http://imi.vc/upload/files/rokaviros.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a4ad822d---36809542408.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff994134a0---suvimelamaxunumafotamar.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/84104514643.pdfIn PDF document text
    • https://micsys.in/userfiles/file/zinabimidununujuwogep.pdfIn PDF document text
    • http://www.moyekolodin.com/files/56450163546.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/57660606402.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/59b5231a62efae425626219a751750fd/33028527891.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/17779c2ce1a8b338f5d9010b09f1b7b8/zewebeta.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/finelijotofugaziguwevek.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210803090055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=honda+civic+2017+manual+for+salePDF 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16452 bytes
SHA-256: 118b2fb6a918fdfad189ce3547053dedea04910966f55e4ae298f0364cd9faf6
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 11040 bytes
SHA-256: 976c7a3ae03289a5279c4ecb3de9863bc17a9f680afe5df49965ab1cc03ada59

Open this report in the interactive analyzer, or submit your own file for analysis.