Malicious PDF — malware analysis report

Static analysis result for SHA-256 db42472c3faacde2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 05:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 088f2ce8a9130a7aba94c5c87810736c SHA-1: 4cacb738caefa09f32ff0e05bd7a9fd5003402b9 SHA-256: db42472c3faacde21633e5e1297195529c2c9b93de96ca18d29c93c907febef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=eurasia+map+pdf', are designed to lure victims into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=eurasia+map+pdf PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00hpvd04s8ivma48uta3fl33n5/zekemaxikepamiravoluwoba.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/30031102890.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2n44ou19jk7kkokdjfltsprudh/gurijimezovil.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/77990804470.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cad46cc83---18549128957.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/88fdc2c6ad9af0dd2c1c6c14e2af248e/duzutaluxomu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/sejijodunedodogu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80823a697---8223924569.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/f43n7f8qvs3p8h1gb9ni4odgve/vetasubewufedexidix.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210612020703.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/40999385152.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/62546614203.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tuzolezideridewarunof.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o5hfav014opschgf2os1j206t6/rurowemanenizafarakema.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/lowewefisideki.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baecfc899ff---75064560189.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/80981782353.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf30cd6e3---masixarelizezopinorutuj.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae84a90bf---kunatoviraderezowor.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/simagatugokuxojipabaluf.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_off0000bd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 19632 bytes
SHA-256: 06111fb55563eceb442b1837d6973d3f5c706c9020a0128f767822c9e94e29d0
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10244 bytes
SHA-256: 250154256e2245e03eb9b2b0c757b740ccd524bbc4ba88e794aaa370d71ad77c

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