Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d96c7ada8e922c…

MALICIOUS

PDF

84.1 KB Created: 2021-07-25 07:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f68d95e783aa5e26096295b94d969e0 SHA-1: 80d0dc5415886e432a5717d576b1313de1dc743a SHA-256: f8d96c7ada8e922c1037c4fefcd63cae33524bb5449b64d833568ca74de94a00
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to manipulate search engine rankings and lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d54e78652---petaxuxaxawifof.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608271e08d8b8---kazadubaxasepafuxote.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/81195984157.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9ae7f73c5fd86703e146febac8d105a8/nusinozufeji.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072636b97bc1---navirapujijizaxafejazidim.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/09f1f4i2ganps96h0hf4v18o54/sezinuwarepoku.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/nemuj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vl464atii7f705nhv350ggkrm1/paxusu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/33086779948.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8b938ed8da51845e60a15ac6f2948760/suviz.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cf013c0a09bc8332a11537a9897a8f06/33577121752.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/71573938454.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9fbc4b50c238421aaeb44e4aef834ca5/56493398460.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/dovodosofupodo.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1fc5dea76ec84f23a0b40b6cbf254133/42670266642.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kijedokimixezuxapezed.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0ba4d2b0bd17574519d4591705bf83be/96576140327.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/suborexirexetonumubiz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094856a01065---69186019997.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/nisigojozixagusage.pdfIn PDF document text
    • http://prosquash.by/data/mowotimikonatifolulutimex.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4382ca7490---laguvipesodazamoxe.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/vigudoxemirirowopejasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kidkraft+seaside+cottage+outdoor+playhouse+assembly+instructionsPDF 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_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 17724 bytes
SHA-256: 20ad06a02dd21525007cde2e1a817d5cfcb643104036d1d8642c4776a12b9202
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 11504 bytes
SHA-256: 12be99ec89bcf4619d3c0a6602936b486a880406f66ab098a33047b80ce4808b
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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