Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bfa9737dad7e18…

MALICIOUS

PDF

113.7 KB Created: 2021-07-16 15:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 936642c77c2f936346293b5625eebf01 SHA-1: cbe7540f69e77073a9ad06f257b64f2ea1bf4561 SHA-256: 92bfa9737dad7e189318381fa32c10301e57d133b19a9aa13788eb1f3823b03d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://laborke.ru/uplcv?utm_term=gangtok+which+country PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • https://x-software.cz/data/file/46471261695.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fec78ad02086b2d358e65e1d6f3e37d8/pezugigisojoside.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metijopaxugozeka.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06dac88543---mipewukug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8cnhou3t38jmp0g31tcv7mcv4h/76529465335.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab65ee7637---mejulewejelexupuvo.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/31121655678.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/guwokaji.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/tawemerefojit.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962598e8c3e---gudazupujef.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd5716e98---gerojoporixeve.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee272c574c2---60253862471.pdfIn PDF document text
    • http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/bixajesinavapizal.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sagozadaneloz.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbedccb6b09---83908738880.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894ac0d1a61---lefutavi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a8llq5pg5or2u0lrf7ojih5374/69187799988.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb7952191---sisegenifenidolazil.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sakolikivimomof.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ced472f226526bfe69054ec21774d643/50246740340.pdfIn PDF document text
    • https://banghenails.com/upload/file/55572111110.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/69095717957.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b98fe3699---73224352499.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092167d8e5d3---25308264087.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_off00015902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15902 10596 bytes
SHA-256: 56008e2afc4dc81eaea1b9120a423382c64e04f454301895b529b06814ce6b5c
font_01_sfnt_off00017148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17148 18612 bytes
SHA-256: 70d150947493237c098eb6fd58ca702fca898542f54feb7caf8aade189b8c260
font_02_sfnt_off0001a1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1