Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef7cbb8e2b2f826…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39e5cee178ed2bcafd833a75f1cb5428 SHA-1: 8446456a70d4df5f8cec7faf4d49570b6fa4a6ee SHA-256: 5ef7cbb8e2b2f826f34695caf88bb32781f75beccf9034d6ad8b28ccba2ea38a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=how+to+use+oscilloscope+to+measure+voltage+pdf PDF link annotation
    • http://kramnyca.info/img/upload/editor/file/japajawenosenitegigig.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/v37uhtji977effhfqntkpv92n5/75789813698.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/g1br31p4pseetbe7umsop40j5b/fowekutilofaweselefa.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/womepelapu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092af7b97914---51717727032.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833485f0491---57531038532.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/39181030642.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bewame.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/68557827709.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bfc8ac8---76305196150.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/butamorimelubovajizuraf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ffc124c38d6b5dc1011c8f2b73bb98b4/zevijafinaxobitadixido.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fexini.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/venixax.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076067e1ff1b---56793437811.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/rexita.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/69847084721.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/komurijadepejavazatizele.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca97d82a594---zorululuwuliwiduxigez.pdfIn PDF document text
    • https://digireg.com/upload/bokapajafaro.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/xulonazo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119486f727---pabam.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_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 11104 bytes
SHA-256: f43255a5b0838d76e6328141badbb1ff68bbfd3ca4e79976b0be5b5f6d273d25
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 18244 bytes
SHA-256: a5ded23964a5c19de8e20383547a4af91e376803499ee9f32cfa8858df7541b5

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