Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8618c04cdfdb8d1…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 12:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fb220c2658f5e0d15ac9d895c0b3eb2 SHA-1: 829ab2f4ec27c91351b7ea6e6b2f5ee2918bbf1f SHA-256: d8618c04cdfdb8d1e4d83afbaa5cc5b3a5ce0a8feccdb931654d3dd5821e87f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The embedded URLs suggest a pattern of redirecting users to other malicious PDF files hosted on various domains, likely as part of a phishing or malware distribution chain. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/egirn9rcns4l14rce9gdls1uh4/fedupevigusonirepadenof.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb75c3572---karozemigagujufo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/taxibapukasikijonefane.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c3ca3f4e---45346501284.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b85bc553b6bb3424ba353e367e4346cb/82095810200.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59c7b211b---todanevofupubivumiradi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/frqnc35343272oab5599ach9td/38926665212.pdfIn PDF document text
    • http://splogservice.ru/content/file/75121430585.pdfIn PDF document text
    • https://baptistfriends.org/media/wafowemabixeg.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bufotu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/gimunavawemeke.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d1c5b4e34726c3993dea428b10224b3/vunujoluvozavaxajeselujo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/13089761916.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/nuxelepomuve.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210512085935_979574563.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c60b31381e034d6698b2f2f0d3f3c664/vetikimewazetekinexemate.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/60759540886.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/velenuri.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/94510207097.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/budes.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wekedajumaridobor.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rpbpaksk1cgeu3q96begd2uca4/23165661278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+memorization+study+bible+pdfPDF 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_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 11140 bytes
SHA-256: 01872ba8aa3adb629e9dc5543f2e18c8e2208ed24b7c4ec9f48fc5fc9c259dc9
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 18352 bytes
SHA-256: 791faf1e901ed8da48758a900df11578e21a85c15237d1d57ad9a425e55d5da8

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