Malicious PDF — malware analysis report

Static analysis result for SHA-256 741246f6aaff97e8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 18:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20095a71a780056fb59d9f7ade9be7cd SHA-1: e06d3015bf3b99a027aef683a772d3a4e4837367 SHA-256: 741246f6aaff97e8485aee1da7bc6dfb27612a8d105fe63af65b0570dbdc2b15
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://faxik.ru/ckfinder/userfiles/files/56151140299.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/luwodedowenejin.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/fopowerex.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/kaniwilokudumapepinoxo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024540105f---27105937530.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6e654d7489d7f49b7f7c6bc91eedc224/24142078009.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/77624900081.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/41907235147.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/33475068250.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052718503673499.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dae3e366a93---50262945360.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/3545762303.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/23530726224.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lorugere.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/69951639006.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/vawubexadewe.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/fisorumusitebinetuboji.pdfIn PDF document text
    • http://garderoba.sk/images/_file/bodarumubolas.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/11e28bd41b5982a307b72ed12f0595e2/gijudivud.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb772b0a00---nevojid.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/7986052783.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1052d5fd972bd68bf1af7b50cf1c18d4/81960468236.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bfce981de1869a167b56c605166ffb99/20930323030.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/89915160445.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/58780015750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=islamic+books+pdf+download+banglaPDF 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
stream_006_off000114d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x114D6 16668 bytes
SHA-256: 6d08800b0736f2391037722e4c6772258e41b8ca8d20cac51f83e6a764eb07f7
font_00_sfnt_off0000b63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 10904 bytes
SHA-256: 6362758ab0f08dc2da2df49f75cb1bd10573ca4ad7b23968bd0ca9db76201f33
font_01_sfnt_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 17848 bytes
SHA-256: 0a95442fcbb1f973a5bcddaf9695e9eceb2665f74f501d45a97d77e940427fb5

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