Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e76a6170198853…

MALICIOUS

PDF

92.1 KB Created: 2021-07-14 01:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3eda36931a77066142a138956277ac5 SHA-1: d69d77a6f8265355b872c784efa32579adc95e8b SHA-256: 99e76a61701988535aaba8b704931a57489023c053975c600dbbc097335b0259
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 reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=coffee+house+near+by+me PDF link annotation
    • https://bnbcostaverde.it/userfiles/file/229049675.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5156d7b7319811bc70dd00c9c65949b4/girepitu.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/25186083458.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e5a24f26---wawurejotefogesina.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/npsba97hvok2lcir5e6ka4fim9/10750676072.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6382344efa---dunovodil.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/96314632402.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/98114386135.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce8fe941f---koxotekatekeb.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/kigudorep.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ea25750c---tumovu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cc10qmimcqs0f61jvp7ulsnnvf/folidamariguwozabi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/58140451965.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/rugevulilin.pdfIn PDF document text
    • http://skncn.com/u/files/45821435657.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/temokuzavodefekutofodusum.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4f83f4727824eac35abdacaa66433441/99126446883.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786e48df5---tuxigej.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a970bfeb---remofe.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6906d1ead---55024320286.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd0daba3c---fekesogibagibi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47a64e6ca---81836775681.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8c98bf05---mijot.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/01486b65e6afe0a3f5cde4eae8b984ca/37905467177.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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10628 bytes
SHA-256: a8a6d92636e420955735144efb71468502af90ca7bdc0027da637615797eb995
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 17560 bytes
SHA-256: 68d1e4990693be3ba68084fa9e6abe7847d213efa1e8fafe55c84f8e4ac61486

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