Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cc02f333638374…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 19:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 545235924f26845a191323de362a7522 SHA-1: 981f11340c3bc9f54d76c17925c33a4e73c68c24 SHA-256: a8cc02f3336383748ee067fb541be071c9bad7d97e4efc42bfb2b00e1c7ec109
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://teplolux72.ru/upload/file/serikilekefimalexu.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa2b3e139---mozapekotofili.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a28817e91cf563fa575016c1c275bfd9/zezisuzifiguxorileluvute.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/pelemazifisenoponum.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/58182014921.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/46056659995.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/56230104880.pdfIn PDF document text
    • http://jonme.net/ckupload/files/gidedidofewelusi.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210902030551.pdfIn PDF document text
    • http://zuche0551.com/upload/file/49030540396.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kamadadim.pdfIn PDF document text
    • https://okazionche.com/files/7550152014.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/82488221585.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3878702047.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/41554412677.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/17563643136.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bepowibisiximepuzowutifaj.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/22294972864.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/he4n964c0c55cmne9s9dueea2j/seveve.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/75638750227.pdfIn PDF document text
    • http://hkwwta.org/userfiles/89438025124.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/90229077225.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/16335934044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gardenline+lawn+mower+55304+manualPDF 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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 10876 bytes
SHA-256: 3983814cb32e7e805503e9ecc5b46e3f535bc50ce27240ec16aa45a12eb05148
font_01_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16864 bytes
SHA-256: a42161caf9fcf5c336925ad6d2c61c2d29421ed200bfed62e6f71bf5623f5798
font_03_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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