Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dd27b628868c1a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 604c3d1f4d703ed59ad62386d8f4f89f SHA-1: 45253477f109736e35c87488c55afaf56b947946 SHA-256: b8dd27b628868c1ad6570d4c8c70c5bbab7fc717a3651931ef2d103930018b3d
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://architettoangeli.it/userfiles/files/54841318035.pdf In PDF document text
    • https://billard-hauri.ch/userfiles/file/dopudijobalereruf.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5a806b5740cc12c9452268a6cdc2ba/50484668220.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/pigunukoxazuwanofofid.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/sipozote.pdfIn PDF document text
    • http://shesob.com/file/files/17543417619.pdfIn PDF document text
    • https://agrando.cz/files/file/82770902680.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/goluguwosozilunogilu.pdfIn PDF document text
    • http://podushka.by/files/files/ragudiju.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210920114806.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252acb27eb---97723204806.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2878d1cce5cb37a9747313926ff14686/72911308331.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabetafilibegusemagepu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143247001012---67668581590.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/retuterojunazeluwozijikip.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/72954126774.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/81876211739.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/dizebuleporuwagub.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/tonodozede.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/9694672399.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/43889653150.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/godonerivi.pdfIn PDF document text
    • http://duef.ru/public/file/wulumezelekide.pdfIn PDF document text
    • http://underbutter.cz/download/foto/saxejigovexuxipev.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewujupopu.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/79605313208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+san+andreas+android+download+media+filePDF 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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10640 bytes
SHA-256: b2a0e24012cdccf7e662437c08d05ea7df1018cc80e14134572184990876547f
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17612 bytes
SHA-256: 7f38c8a1af68a47d42b24fbf10c2820297b2c3bb7615eb026dac4c58e5e20a2d
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1