Malicious PDF — malware analysis report

Static analysis result for SHA-256 197751f18d7fb532…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4eb37f173475e6932aa439a7fa7e47 SHA-1: e131866a80c999df5986ab2a63d32845c8093dff SHA-256: 197751f18d7fb53255a640c9b6ce3abda461410cc66a4f250e3fbb35efe9abce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/zumudov.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de9294525---84985818772.pdfIn PDF document text
    • http://goref.ru/files/file/ronuripivusamuxutas.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/3022701929.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/97745209686.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/51540337477.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/22763955217.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/52rpopik3k43kcomnshlupf918/30257041973.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883dcc0e0cd---gazotur.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ki1jabvtpmhtsi6be2jdekjpu3/lexakogewugepewa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c9519b58---50807703929.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/xumizizuzasabuvujov.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079846f0c0---35815156667.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/73725273245.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/90698989897.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3cb12532c2b4426a59bece9735b9d5d5/45271803982.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160887e8c721c4---47911014819.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/40078021836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+find+magnitude+of+resultant+force+vectorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11064 bytes
SHA-256: 34f2fc70ed44237e874e13b61a639c84f9435da280aa288fd71796e074580b28
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 18408 bytes
SHA-256: 30082e92b9484ad026d7ec7aeac38ebf66fea2491bc1833e0ff9b126f9ad85bf
font_03_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 16172 bytes
SHA-256: b1bd5690beaa374b9073da8cfd0961bef7dc044fe84bbe97f8390ce5daaacaae

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