Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef875fe9abc0d97…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 02:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f3d4967e4edf4be4e0d24d864bda88 SHA-1: cc18cd0e712b8cc512c1ee3688404deb7cc72acf SHA-256: fef875fe9abc0d976a74c0590a6f4e2de37d62afb4d853869961d2bb496cd32b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics and URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379ef88e9a5---jikefalesajawamalavala.pdf In PDF document text
    • https://drproperty.in/userfiles/file/79094450241.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/buluvivenurafesi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/79043670721.pdfIn PDF document text
    • https://jagominum.com/contents/files/60397636197.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/kifoxukajedimesij.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fugekebenasujexubedelo.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/suzakuvuvipafomuvisosevup.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zesojututomekefovusizip.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/41543324641.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gimiduvoveje.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/lebul.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/tamuzalijusozulejasojuv.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be05120358---vogojasuw.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/60325069958.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/67907508100.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/doronefav.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovukevukowitozojoje.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/92543788625.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vijuwalen.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/13mrdav7bsifh3nv2a51br187j/25278180888.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367764c6b02---niworumoburuvinataxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tides+a+fishing+game+apkPDF link annotation
    • https://mediaget.com/userfiles/files/zigedo.pdfIn PDF document text
    • 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_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 10636 bytes
SHA-256: 2f0961c5339afe4405a6e8db876c6df0e4496ed9eb5b77a3d0c7b74451b27039
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 17188 bytes
SHA-256: 5e303724eb9f11a179ef6ef84b857c24080c433f359069a3ca4d29ae85145dbd

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