Malicious PDF — malware analysis report

Static analysis result for SHA-256 f302eb2e5d245f35…

MALICIOUS

PDF

95.3 KB Created: 2021-06-30 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 988db78dc4e4d1ef28f15316999801da SHA-1: 346181dde79ad430b7c704ae307010728af39717 SHA-256: f302eb2e5d245f35dfdf9cdf12127cfb79848788a11e6c68bf258d58837f0b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://augsburger-dartliga.de/uploads/file/tujovirukomojixigatelab.pdf In PDF document text
    • http://kfbi.ru/content/file/fosopelulipi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pulisamurosatonesu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/wixametogawilenegagotig.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a4820627325e8f19380092162c09462e/rekagug.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wupud.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/mipozidezufofamuk.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/44957416824.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/r2gf9kkcugj1htnraquu792i5s/pozewumebikomaw.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hh06hdh8rgu0sdppg0vh6u6440/nolovujexepiziromedelijas.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/94852750883.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210604142559.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/31772042270.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8972707e4097871c8141f18ddf35ade/botidu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5d2bd9e2c7ccc522357b1fec45d2c909/99164078166.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202162695383019.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a772e0f709---66910599216.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6f418c1e87ead38d76121ea88c4507fd/losul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hlfuk01q83ebpfr3mab9o08ad1/risizilax.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q86iqlgk73ea6ivn6t7kjgjr54/nifuxuzarubejawuso.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ab0b8b36---divebenitidolobixewil.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/43914604851.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/sapasoluxosekena.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c95bb8da71a4c37b0526576e3a37aa3c/87648198659.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a69c9a2a---jidatowilezenativekoxiwav.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a338cd06e---jipuwabokirixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=difficult+comparative+and+superlativePDF 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_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 21580 bytes
SHA-256: ee090c1818858cafcba89c6867632bb2b3c760a4cf42c2951e7e561dfb8294c5
font_01_sfnt_off00013c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6F 10948 bytes
SHA-256: b149b2f1cef1e12ee74f59ab08ef238dde8afa5c496e0d54e3bfaaab1af3a7be
font_02_sfnt_off000155d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1