Malicious PDF — malware analysis report

Static analysis result for SHA-256 906d49febeec027e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 05:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddaa2790dd9cebca1b1c625630229154 SHA-1: c36e779cec93fad89ef5f1c1430d236a8662afec SHA-256: 906d49febeec027e1cc40e71374d137e8521fcc1c3d8cfab159338f26b1f73d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krasneclanky.cz/uploads/81032616861.pdf In PDF document text
    • http://gabident.pl/local/userfiles/file/wanewobolisowesokugu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/fidodorefek.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/42389188255.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/vatagagunewi.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/bafov.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/87529914341.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/gajetulodixomozujiwap.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61f8aea7a---rajezixepati.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/narok.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/48754058792.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/pefox.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613318a68f322---fijiweg.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/34808430642.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/tusum.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wazemidekuz.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pogawubomela.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613398eaebdfa---11216815347.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/13863216978.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nomoxizubotetoguxuzap.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/95028289883.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49ebd536---guvuwatiroxomagituma.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/69898017521.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/18295386232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=qr+code+generator+applePDF 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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 10488 bytes
SHA-256: 7e5099bd2d729fe245298580ad8f1b32c2ad16c29087ae4381d7884a7dd8b56b
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 17308 bytes
SHA-256: 6fda327adf3709be24e16d2f686baac31d546155bf21ecb872a9d4795ac195aa
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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