Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7df43fd26cd9af1…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 16:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee2430abf933c95033af9cc0e676d8c SHA-1: b3ab61b3634dd02007513ad4e7ff70b35158915c SHA-256: e7df43fd26cd9af14ea0037d8e6e2a9ac3622cd21e12b003e06ed82482456492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=what+makes+you+the+ideal+candidate+for+this+position+marketing
    • http://lapenya.cat/imgjovesnaves/file/zuvuxologa.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2606970a29---tinarozefajawubene.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608befa1c022c---sevinoranejofezer.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70h81vdeioe9vjo7ppff1e00v4/filinefagujin.pdf
    • http://didula.com/img/file/3681819448.pdf
    • https://mmszke.hu/files/file/jeriwotaten.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb674d70c3---likajegefusovosabejubote.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af91246db74---bomuxawafi.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef634f36e---vafelagawez.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4v4ufp5alvm7ue8g337qp2dlqj/tafepuxowuv.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edb0e81ef---wusogejid.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9a3cc3d5f5fb4013af85d0aa0272491a/76938756850.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0d85ad0---78328497049.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/99572813419.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5986600b3---20709487092.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780e501de63---kukafivetewugawegu.pdf
    • http://proxima-design.cz/files/file/nuwojajorulabo.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094834dbc729---gamapabelogibejadep.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb667abdb8---lifekovuririfamo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56bd2bca3---jobojitedamumunuzavej.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8579e87db3---48376347845.pdf
    • http://aranykoronakft.hu/userfiles/file/zejoluwuju.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c508be274017a1ad1e77d78f8fae8ec0/13273031173.pdf
    • https://laser123.com/geektic/files/49758347819.pdf
    • http://dblbtech.com/userfiles/file/38720792222.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1e.bin
7a4f2e6cde0c98bcb066c7a65386ea39666b8e766d66445f32d3d3b1f978f555
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 17080 bytes
font_01_sfnt_off00012a41.bin
5f550fe6b1e497d47da3c5fc05a95f855d0938954e90df8039c3df8dfef7ade1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 11368 bytes
font_02_sfnt_off000144a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A3 16792 bytes