Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f978e31dfd493db…

MALICIOUS

PDF

84.8 KB Created: 2021-07-21 17:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2aa95c542d3e206eeb53d7ab0c3636b7 SHA-1: 6dcd0e9a05dab562eb822dad615d907656dc5a0d SHA-256: 3f978e31dfd493dbb707da07999a1a8ec6b1281313ee8d836958166abc4636c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://directorvincentchow.com/fck_filemanager_upload/file/vopisuvumibitivumojamamud.pdf In PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wofopuvafanaje.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/pebetazifudubizoxumen.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tazevaka.pdfIn PDF document text
    • http://derma-dts.de/files/file/zojawidituxasod.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16096669f281bc---puguzokaxugoreluwezawad.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vizalobogerugurafotukat.pdfIn PDF document text
    • http://newo.ru/files/files/zugapotaxij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18a061593---61151504493.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/koniduxozadidugezuvikapad.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/makodetovexamaxakakazat.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bgf58qn5j08k0u2occ59jtjos0/75899046978.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e8c4608931fd75eb32d5f3c1485acc7c/sejosekakikulafanupifakok.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/44805436967.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/80785738277.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/783e0d185da66fe62a4cbe4714c090ac/zajuzoserozawop.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45572140986.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e59bee249---fafivumubobuba.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cfd7ac41---rupemojibafagibirotu.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/bozapupopa.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/kejejojutamemijopugevap.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bd3bca03---lebutugudivipabasugo.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210718041938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+fly+with+elytra+in+minecraftPDF 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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16972 bytes
SHA-256: c71ebcecd622ff6c0546ed76b58749c12ca9691d24de3a0418ddf48a209c4483
font_02_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 10624 bytes
SHA-256: 072415c725863dea4cc087d120f3bae0e61281707c0896ca56651e3ca8e7ba89