Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca26c8163f8aa0c2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8639634c84ff6155b8674035513c27ff SHA-1: ea29432cf1fe74c3f8f9a2644fcc9d877412ba58 SHA-256: ca26c8163f8aa0c2829291cdccfa3093b0911efbc94d1f332b3b1b461d0f6644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

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://oniceh.ru/uplcv?utm_term=ios+theme+xml PDF link annotation
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/42771032429.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3ev37t0s7s8acbknti0o1a84q0/47832081684.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/39084804878.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/428b42ddfc27fb216f310c8c1a4613a8/mowevimagazupinipaxowom.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0508034232aed40817dd410b1ebdfd7d/7177241569.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nisijapinixe.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/wipizunipew.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/giwusumilune.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/rudemarone.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8e4cvumh72fsupnsif20to2osm/sogijivo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/6046623260.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/kodokeloturakez.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdfIn PDF document text
    • https://magerp.org/upload/files/59711706209.pdfIn PDF document text
    • https://penal-garazh.ru/files/gepukagexasipiguje.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1a50c8797578571c058dc1d20a710f74/32213240943.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/75130547872.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/90833537175.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba5926643---50891086782.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/79804611565.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/dalagotunedokej.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/putipurepe.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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 18832 bytes
SHA-256: 3da1b4a943a0a0be01caca43b43af137f80e4df26d626a57bf7e69e2d4ee209a
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 9968 bytes
SHA-256: df8905b419c6652dcc6e4889000c215922614484b8d1dfff869e21ab9f362c4c
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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