Malicious PDF — malware analysis report

Static analysis result for SHA-256 a983fc863ae7d029…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 05:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5b7ca894337e62da92d421662ff4ff2 SHA-1: edecab4ae87f785dc12671b64ed998300c20df9e SHA-256: a983fc863ae7d0294c250b2825627db88e9aa183e29b4be7276aecda4ae8513f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://crewmak.ru/uplcv?utm_term=parallel+pulley+stitch PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03deb1a0d---75230057460.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edee7aaf704---48526373193.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/13838288866.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/92927298923.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/wokevazewasagiworadevok.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/situbusizofo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a115b7a76---ridib.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/74261505642.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/84482554575.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/muruxigo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b3b533993---nevubepadut.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/xaxutekotan.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/561778005a852ae527787b863fedbfd8/54388833084.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/72542054899.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/27532949455.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d7851019fc48318b164912a68510fd96/wixasodasage.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff804cda9---58699319324.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/82967407791.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/suzivamo.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/13785216942.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f7470a1f77a136f99b72af69f9083bf3/99729662023.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/91885055695.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_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 17412 bytes
SHA-256: 7e406b7826a62fbe4bb551cab8fee2a6ab5112551c995a12eabc7cff6d1cd9f3
font_01_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E2 10460 bytes
SHA-256: 22b65d062f63d48457947d093f4aa03017c1ba09dcea43abfdef924d21ef9bb1

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