Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b1bbad68f3041…

MALICIOUS

PDF

81.8 KB Created: 2021-09-30 12:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4e0f3dfd4cb614ee02b01c2f915083d SHA-1: a8b4b1342c0a168ff9d8f791e69b3471323015c9 SHA-256: fd8b1bbad68f30416ce61c079e5bef6e2d914f0d9e1214c8a3c1b90acc7e0010
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be part of a multi-stage attack, where the PDF itself provides instructions or a password to access a malicious archive. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=powerdirector+mod+version+download PDF link annotation
    • https://ccaquebec.com/userupload/files/49256900816.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mndeck0nb6hkcsug3174cpc0jm/nisadotalosol.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/sozaguxuravegabazefumu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/44228786893.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210924205911.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/zilotonubixefolo.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/95491190465.pdfIn PDF document text
    • http://runhouchem.com/upload/files/61823002609.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wobavalofepobimujubuge.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/3679421586.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/rujoxifuwaweseweguge.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5f9c3f8cb3c90a1f058094a3fcb09e87/lololububazujese.pdfIn PDF document text
    • https://cargotavio.ru/files/file/16600360612.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/68095247717.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152fe904d748---16002474721.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/velagorodejuba.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/87594970252.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/zebijefutaniloboduze.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/27141585220.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/6257103693.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/lugexujevapurer.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/towopazu.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/xigub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 22212 bytes
SHA-256: 3eb79916c908a02d5bffbbc4ae892c6591d899a84aeca3463ae41b080861c7d3
font_03_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 10684 bytes
SHA-256: 46438de14a7349544fbd0532f972d803114fc349131614eaa6b0d5461e339fbf

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