Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f1927abe94bdf7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 07:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5690c4bbfb8667d9d153b54a4e990e SHA-1: d44f654f96c8b18dc5f0598876f8a39bc4c5ed58 SHA-256: 79f1927abe94bdf7d880be61f6bdea089cd4957026c0d73ff8dff35a284833b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://radio-salsa.com/php/rs/filesupload/file/mijowunonede.pdf In PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/tidobijutajenizi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf22b06fc---84431893145.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/92684507029.pdfIn PDF document text
    • http://18554080.com/userfiles/file/88587936350.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff64c4d58b---tefod.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fn1tunssf4s13f1qvgq65dk244/18740642164.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/m22pvl24jlm03i4u3mao625r70/bosefawuxisaperadafosebi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/83278924955.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/77059064714.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/79508767886.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210818190553.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/99733945191.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xafalurolanemusenuruzafa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f0fb89fa---74906264139.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/aa7tjp3chvq0e002ijqviuh44c/detotovogabaketovaluso.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/21494331949.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8c2ff1f87445057a05dc34ba5c796646/nebiwu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607958b78e346---musibexurevi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2ei6i4qppu0da97pmcp360l671/donunemobega.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/lekulijubusivomotuta.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9np0534neel4a6c9glv3iqp1kp/49364328907.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/45484486227.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/77158771948.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/120c1365189795e631ba4421f7ea0464/vopuladarerinoxowudu.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rigupiwuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=diary+of+a+wimpy+kid+wrecking+ball+online+book+freePDF 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16800 bytes
SHA-256: 7365bc3671bc1b0eccb92d863b5ee952b17deac22463808dd5993804674f9568
font_01_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 11132 bytes
SHA-256: edfe92c790457d48fd9af93ae82cf45a90e3c9fdedd5604fe42cf563823504c1
font_02_sfnt_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1