Malicious PDF — malware analysis report

Static analysis result for SHA-256 5580419c3a6759b4…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 07:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8a589b8e87ad116b529c49dad0bc824c SHA-1: 31af47aa3452335a9054047f2cc93f628072101d SHA-256: 5580419c3a6759b43bef8ec237cee3894177cde0fd33b5f642c9090d83abbe13
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. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were directly extracted, the presence of external URIs and the nature of the link farm indicate a likely attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://irlanc.ru/uplcv?utm_term=how+to+pronounce+moi PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160767fe2d887e---43133632150.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/v3ft51da36qbmhkd3ussj3dtm0/nodotatorulijonujukapimo.pdfIn PDF document text
    • https://landbar.com/upload/files/17916685438.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffee16b816---9481658251.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/47454932859.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/9aceccfcmlugna910glalgi883/20986457448.pdfIn PDF document text
    • https://nada70.org/userfiles/file/dowuzojagu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p2ted0am52rark3e5vfjk623bb/jekedelewaxiwi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3c48cf4b059f6d5d9221ec021521cfce/96516105905.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c033ab6d4---kemabepodanibam.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/23686422978.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/81595594642.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4937690cfd---75930209984.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607adba0a5e46---42058579955.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/kj59d0gjakvbrvg2s4ams88l7j/49670333777.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/97249233891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf3a04029e---nijuzudijobe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1e011333c578cc8846744f6521db3ab3/bilinetubixefogofetafoge.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37141237951.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1a6b1db6---99640173056.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c88165ce3c4---42866179504.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7049518b81---zosikimenebenuxesamidedi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/guzodaxemeralar.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1968d5e4---saweliwafivudi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10336 bytes
SHA-256: 019f1a41a40a0ffb7c5f8ff9180f151243f88d13a3ba80be8443bdb9e4824522
font_03_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 3344 bytes
SHA-256: c5a36cfbe7c48e5d56ae65380631c193cc3d5be37c891fe1700476b9f808d72e
font_04_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 21960 bytes
SHA-256: 13ea5b62672a612a797ad4bfc8de826b8bac27f937e4266264d7befd3fc0df1d

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