Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511a45e4d712ea4…

MALICIOUS

PDF

180.5 KB Created: 2021-07-22 16:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 656aa499b4734403076972d1a0d14ffe SHA-1: 2b3687d45be13c161126b7e3092ade5482df7b5d SHA-256: 5511a45e4d712ea4a297de6ea91e80fc2c5ec91728b8418e7d35c5cbc22be8f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The primary attack pattern involves luring users through a malicious attachment to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9463

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f66659bc5f3a2afbf03e5dcd6da85c03/75091395385.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098757a9e446---modeniva.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/33be19162803fa467073e15b5fcc1e79/65084134916.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/46596949910.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/famegararifepejarogofimom.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3b3809bf86d0ddbb936bb94b67ad4ecb/36864983396.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9d49099d642c2d90bb789f47052ac90e/tijutemakixijawokikajol.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/dumifakigumek.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqdgc7uge2kasfngeh8e6d7sc3/90729502229.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47e49bd37---18923288635.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4a77d3d6---63410878100.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63de0ac66e4f98fb32eb1dbaf6eb5c17/rewideneku.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e8d97736b614ce616737f48072790046/kaxokesozofizoxuwi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7d449ca8---59183451312.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ed075be6---xafojemoxilesaxemisijexog.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/perosorisozi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pirijasebudikanamawopedar.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/sajonubedabotuxome.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1a6171da---14592435906.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/xexikuzubilikejetoferiv.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rq9o9adlauten6trv97o4tsa70/85361234349.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608049f7585c0---kinosadoxazoden.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/51283778710.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/47465245076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=playboy+pdf+collectionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25335 10288 bytes
SHA-256: ddf16cfbb3270daac26e14bf3d307cbbb4b205a1b734eb989eddbb9052918a25
font_02_sfnt_off00027516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27516 20656 bytes
SHA-256: 351c5b0fcf197a0805281c5ddc83ea46f839e0a54845c62ab409dd6ab200b385
font_03_sfnt_off0002aa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA30 10600 bytes
SHA-256: 55cc0127eb43cbb6e9973117f4de8151386cbf5d70a11d229a00e7bd1b63f5fc

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