Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f3c3a3281a0af4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 12:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37a9aca8c40237ed9063584b559c6703 SHA-1: c551b53f9d64c2627b4b6a1b8c25fb1203bba2a3 SHA-256: d6f3c3a3281a0af4d150b36ccc270e62dd2a2c4102314b9caaa5b430b62d0420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to exploit user trust.

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 https://inwebjor.ru/uplcv?utm_term=total+bones+in+human+body+pdf PDF link annotation
    • http://stringquartet.biz/web/images/fck/file/24587251415.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cpc053vs4n6p58jm19fite6oqu/vawosuvid.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/63694929254.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d400fa32---pedepepus.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/mejefumufafugijesazejo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/76623ba3907da9d9d44419ef2f6e24b0/sarawevuwupajev.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/43285547402.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/7320891930.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8afd1c234---zuwigavizuxaxe.pdfIn PDF document text
    • https://akemi.ro/hirek/file/98240442999.pdfIn PDF document text
    • http://willbramephotography.com/ribejemevavugedegikasuzu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b12e165b2---fezegixopoxebizititudidi.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/lixokasiperibiri.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/72145894387.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210703235402.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/85a7530e7dc08e8973a15b97101e4afb/21651472786.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/50c6da17ef37bce4fb2b1435007e055a/vovekubo.pdfIn PDF document text
    • https://ibericadearmerias.com/file/ponavuwokowigom.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/24978357455.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/liwopifodedegovolojibubo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/69cb6fca391bf10b42897f65e770417f/vevaxamog.pdfIn PDF document text
    • http://texmet.pl/userimages/file/5106738832.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160797f766da75---69719535312.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fuzenobemereguxa.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/90607865984.pdfIn PDF document text
    • 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 17216 bytes
SHA-256: 655815df8e52b4b7d26588b8aa444eb0a9ccf2746e0f33f4bbabc8f55962237b
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10980 bytes
SHA-256: d19f05a07a7c43a463b86267e8a365c5311661898069380b6513686f6889fe2a

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