Malicious PDF — malware analysis report

Static analysis result for SHA-256 240e11dbebb5a926…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 14:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a276834102dcafd43a22fc1abcb7a80a SHA-1: f33a2fcb15c412351add321fc189dbe04c184cd9 SHA-256: 240e11dbebb5a9262bc32bb256be76f802740efe6cfd73066ba393a3bd2370fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to other PDF files hosted on compromised WordPress sites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan payload. The embedded URLs and the structure of the PDF suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077a54028bb9---69907220315.pdf In PDF document text
    • https://appvid.eus/userfiles/files/79872263235.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ba12788444f8b8e893b67d2f0ee2afb4/vojekokazavaligubijug.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/127e417f85623219b305b691760aa4f2/52925387733.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bakakinowijuragiruvabe.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/nibezoduxexusulovemoveja.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73f1e14af---13850888298.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9bdd0d411---wawasamexedok.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64c376077---84561748466.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zavedulad.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/pajomafitubazizo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073337ef21e3---74764804120.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/eqndb6h77fn4hnvqtcp48oi80t/kaniruba.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/17240252073.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/87373138369.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/28348582791.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611110827b66d---nejosewebapubozujitoxig.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6a48f0a3---dezeza.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adc19503afd---44098715943.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aca6d23a2---54489055300.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/o6ek5043skbv6unmifb7jku81r/kazajosaped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=zanussi+fridge+freezer+zbb27450sv+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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 11312 bytes
SHA-256: 9f0ecd4d54d50c590f3ed0002ddf517353d332872924fb1e5d5974f1f2c0ffba
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 18132 bytes
SHA-256: 4b571586cd1fc5cd1b8818b66b78060fa1ee25ccf51c03f401105ae032e5a79a

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