Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b04c90a9d04256…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 20:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 152eb4fb4ad1a5af897145c46577e2e1 SHA-1: d31048b16709671c17e7ee0ac1aceba2985d2edd SHA-256: 92b04c90a9d04256ac93f57413446f224a084d9edb45fce3b72e10215a138853
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded links suggest an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ever-pioneer.com/upload/files/25067594133.pdf In PDF document text
    • https://vibangnhadat.com/uploads/files/51178267539.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/92892476632.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/finarufifodipe.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/jigemo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/9525403443.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/37844267467.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/foxiwajaxinojokalilazeful.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/wojijew.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19532095484.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e752bf8bd---dalet.pdfIn PDF document text
    • https://spyboarcams.com/files/14597797178.pdfIn PDF document text
    • https://frisch.ro/files/file/joneridi.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/fafupirolojuv.pdfIn PDF document text
    • http://netflor.pl/upload/File/63942144896.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/doziju.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/95498105732.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161350583a7ae5---10883050463.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/kagukegiwit.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xineg.pdfIn PDF document text
    • http://dytac.hk/userfiles/fixazoluz.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/walexobuzelikoriwef.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d0361604---tepuwakunotibijof.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vamuxa.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/52565287793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clover+go+manualPDF 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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 10288 bytes
SHA-256: b09157c5455f7c20bc90f33a44d981d47df1f949da97157fa98aa11437d9de0a
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 17264 bytes
SHA-256: ee88e331b1fb21184c81ec29d643b0f8a63f035c04d3de01d6aef27a409185b4