Malicious PDF — malware analysis report

Static analysis result for SHA-256 770b25ba0d14d06a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-01 14:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 14d5cb20dc22706f94b3e88b157ff3b9 SHA-1: a8c9841d2d994d42ab2f9f76fafd79b18d5633bd SHA-256: 770b25ba0d14d06a2d0ca712cd5f27b4e73f0f32b6cdcb23a542aed1d6c033fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/51899179388.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce61daea52---67602760776.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90e4f35107ef28627e2356d42dbbb00c/sowafinalewedodolotafazi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad8a94412---24623453307.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/52507908087.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/69052051820.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3192aee460---7180335436.pdfIn PDF document text
    • https://biocoils.com/img/file/rodow.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2138b20ada---femuxibumisanepi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082563032583---25921341017.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab6f62408---20037155701.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/nitiredizepasotedobojateb.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb668b0bb---15153138553.pdfIn PDF document text
    • https://blogsma.com/files/xufevu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/garemhfh49qr4gfhihq7u1fib4/kilobagakofazewitobu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/68dv3mvav7n2ep31v5v4mcus12/41810635444.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe96adc499---24904295272.pdfIn PDF document text
    • http://soles2walk.cz/data/file/voxokabalaputolomomo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ac22dcdd8b959d2d310a3f4a0c4aa640/vosenokulenosig.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2f808aa2ed20afa7c73cc093a2540b78/rotakedopudavujalenenevew.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nusab.pdfIn PDF document text
    • http://nfc.soo.jp/file/96441528087.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50164060378.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/87183817790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=slurp+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013101.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13101 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 23120 bytes
SHA-256: 58726f1b49d9a41fb6d451278afa9fe4499e8121cae4733fc8982fad6fdf11f4
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 10656 bytes
SHA-256: 3550712c9bb016cdd1f02fbcfb72590b0e77748c6676ea38ff41956583510df2
font_04_sfnt_off00014e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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