Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2b56036bef1a47…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 14:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28a4c87cf52ae360e35a9c5e1494c459 SHA-1: 7843b31157bcdb83d9b52f8b9d7cb378ab55e773 SHA-256: 2e2b56036bef1a4700db608f880703da11f637d98c43b5e60f6e71d2929e49c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure itself suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=gallipoli+mappa+pdf PDF link annotation
    • http://burattinojatek.hu/userfiles/file/12894830993.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/88296014198.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/bofibetexerore.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0d8b1cb0---nowipofupawenesibolafex.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/21552519019.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/xebek.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/561736bbfbb89f2608a34eb0fbd1f290/zonivu.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/84039901559.pdfIn PDF document text
    • https://harom.ro/files/file/33549907833.pdfIn PDF document text
    • http://dsagco.com/Upload/file/82966839556.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sixanax.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2vaocp95g3cq541mhg6udhsiu0/33543637115.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/pajupalufef.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/jijabaf.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/terijarorajekotutibejipo.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/86688385474.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e14c11be---merokegabanizo.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/katudufu.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/83638638551.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09ce23173---74980449890.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/15076873920.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1t1lou0b6pab317kaelf9l2n0/jezovufibukoxemiwakuvep.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/98868582659.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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 18820 bytes
SHA-256: 58361a3c65fb4d90afd01cf03a5888db1cf1d2a2540bcf712a79f6d87152c500
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 10096 bytes
SHA-256: c7f14c6de81bf2c9196310ae6150e390850f32d9ba07243ce88a4e12151e2dd6
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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