Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f066b0b2f5eeac9…

MALICIOUS

PDF

105.4 KB Created: 2021-07-20 06:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e88d29ee0ee7d70376e315c30c9f2d1 SHA-1: ce393592cfbe2d33b8daf35279f334bf61fd82fd SHA-256: 1f066b0b2f5eeac9f0295d23c8b47bf0d98daefcfbe9371d975e8ef2d5119e72
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210614205151.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607838b1a1a23---95294290018.pdf
    • http://businessvaluationapp.com//fck_files/file/68410173830.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072b108eca75---jagijixupabuleri.pdf
    • https://wagaskar.com/media/nopivawubuti.pdf
    • http://marinapogon.pl/upload/file/81875147891.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948602bb0c4---nilijenenunu.pdf
    • http://shqinze.net/admin/upimg/file///56399193574.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c024dc08c03---58069391423.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e01282a06e---34085452292.pdf
    • http://soft-pro.hr/upload/datoteke/nuzivoxazofazixogi.pdf
    • https://thinkhigh-tech.com/d/files/notirufokidefulukunizefu.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/diwagupuvejaseselanef.pdf
    • http://liddellgaryfamily.com/clients/863293/File/ritajugapeda.pdf
    • http://beveragesgs.com/userfiles/file/49818333740.pdf
    • http://coreaad.com/DreamDataUpload/file/sivozapujiduvabalelisipa.pdf
    • http://mopron.ru/upload/files/mudawibalizabejorurakota.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e95g8ef5s6ququrgvho62jru9k/46123680731.pdf
    • http://hrzservices.com/uploadfiles/file/54699845114.pdf
    • https://cgeminfos.ma/upload/file/wijadajobixu.pdf
    • http://classtool.info/upload/files/9159196230.pdf
    • http://quocteanviet.com/img-chamthi/files/xuzufefalebutolupedita.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba700a76841---zoteje.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4a2e729265c129113d6fbf1cc39a6b36/sopekujobidatixuwedef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=alexander+the+great+first+conquest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013969.bin
7862a547c7d202245af51adc89b3a22b23d45b7cba15dd96f0c08a69468d2c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 11084 bytes
font_01_sfnt_off000152b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 16792 bytes
font_02_sfnt_off00016ac5.bin
4db158c7b6d369086a1ec4e3c63fdc9d10d23bd13691ab25e165cf26c9bb9067
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC5 17016 bytes