Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bdf7f9e70762df…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 01:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 417117e28a8bc69b0ae263d6ca82ea55 SHA-1: b8dc87c99fe5ac76727adafc6b749689e55ae3c4 SHA-256: d3bdf7f9e70762dfe4cbe555fdd8a4fa7fe3766df28767538c59dbb1200a8384
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely intended to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6177d59ae0---2402651855.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9dbd6eb08---vavorapoxijaxup.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/sigabokufobamopudamelima.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3fc924e8---mukisalimawe.pdfIn PDF document text
    • http://yuha.be/_files/file/vujes.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/43831313164.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745faf9a99e---zisodazexapuvop.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/6809782961.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/gumivosudo.pdfIn PDF document text
    • http://spharma.ua/files/file/xikubusagukuxonudetip.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc38777d1---43792030047.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/35219850064.pdfIn PDF document text
    • http://meta-min.com/files/tezisubilibazuxixirifexe.pdfIn PDF document text
    • http://belloverde.net/emailer/file/kobaxukuvafefobeb.pdfIn PDF document text
    • http://www.moyekolodin.com/files/74198671388.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d1eefcab---18814807714.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/fusirilovur.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/63649454680.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/55901697901.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/22732671623.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154a1675b3---46139612721.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xipij.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/95bdde76785f7d01dbc2e04d63623ea5/59439376296.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vs757u6cc6nua9def3cpcbmq7r/73853380770.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/28805595599.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ac824b12---gapapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gender+socialization+theory+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17504 bytes
SHA-256: 6af808e3f128b2907ec3ef6d9dc5aa169b7d9502279f957ff235ef98c4c8d4f0
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10928 bytes
SHA-256: 7f72b40e0294f493b671c2d6d6caaa9203bfdbf262883b0852808d14593d7380

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