Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4763bb6662384e9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 20:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c73b02f37c87e6c1d4845f22923190a SHA-1: 0e71613f6fed4fa46ca4c74689616e1eff0fc21d SHA-256: c4763bb6662384e9c47a65c6d89c3937c7ab7013bd5eae8914cf949d783e9fe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites and disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://klcmekatronik.com/ckfinder/userfiles/files/71405261731.pdf In PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/26347057381.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/965ce0288c34997e5e82e9f6387b08a6/82104829730.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea4d51cdd---78591021214.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/67201897339.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/jukulemeki.pdfIn PDF document text
    • https://anfauglir.com/images/file/24939968252.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/tijodelaletob.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726975e751e---xemabemebeja.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pavimerusivo.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///55106866854.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/90511742522.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tiguwobodenufitofu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4e5bfbfa888bef927be22062b8fa81e6/jigefuki.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3032cb516---43399851035.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7758eb5784---42070596761.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd78ece90c---nawobeg.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/zizimu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/zutadukugilopi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ddf450b6de1e9677c5cb2d436d018d37/jusijifezator.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/sozawemegixedawujuzo.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/30229619086.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/zulaliwizubepifiru.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202176114443310.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/jasaxetibade.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/444835566.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/61289317355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=val+thorens+piste+map+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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 18240 bytes
SHA-256: 582c22b936be250f997e90a3fe4b1b06126a2d72bf85b0d5f8e0a3e9dc205c9d
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 10732 bytes
SHA-256: 53343debe4b7aadb1d088aba9795adf648235d8b099c901bdfa492805ad0975b

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