Malicious PDF — malware analysis report

Static analysis result for SHA-256 5786d6ef7faf22a6…

MALICIOUS

PDF

89.4 KB Created: 2021-07-08 07:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f89b098fdc94298c412ad8d939d1f985 SHA-1: d3e465c7376ea50bdab41ac3acffc7136ed49e9b SHA-256: 5786d6ef7faf22a6dfd3a407cc0230556b41f53ed3f92f36e49f96dad6ce82e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various PDF files hosted on compromised websites, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffe94dcab---49186595355.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3fb7491df266a5c5ce9e7fd53a667ad0/mabisejumut.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/31349105509.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kafofarufuwinesebozefiki.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/91601276487.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xipowutotewojufafo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6f03fedc---xegufeloxosirudo.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/16415539725.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4gd8c1dri20fs88lidnbt49vv8/wamusositarikuse.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/81430638253.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a9c3d6c6---moxolukulo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2f18df82---51540240071.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wuxezoromilutapobu.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/14f5864af0132eac714954a81b3edd32/zabikudevosajob.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f48bee9640e14106962c2482a799f9b9/webetifezamozuxemavuw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f23c36b696547611bb4f9ff61a1836ab/25314130032.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/lewitanilegogi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/55397050057.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/73ff6f7b4f4fde71c807fb82ca919b36/rijugibokesajikizix.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/8708475395.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d4f62a8c---66883916220.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uks2q2gojhhroc9621tpoqt4pu/telesuvili.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/69762617092.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f724326d---zirugena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=combustion+of+octanePDF 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_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 18132 bytes
SHA-256: bbd16d8e75b6701f35e03e2923ef1f2c822b9814a6c3c020e23018c78c4ed2b8
font_01_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 10620 bytes
SHA-256: 89e22b453ccaff5c3999b7cb7cd927c661231f1b98d13d985644e919674efa5f

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