Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff2aff3fba9fa62…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 01:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9b8e8d07fd981ba7c6b6bff606867f7 SHA-1: 9bbd078f6784fd4fac6641f9e97fc440343be8f3 SHA-256: aff2aff3fba9fa62fb72ab352a0688a2689a80fa4736a73dc7ac62576f8dd401
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bffb330c---46373999850.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d607896bc12---46100909298.pdfIn PDF document text
    • http://poorclarescork.ie/images/941595054.pdfIn PDF document text
    • https://senfina.top/uploads/files/lunijunavuxidegomuwalib.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2800da3d---sepapijamofunudedewi.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fixamudakebikanuvil.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ab2547f9---64086321073.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6864be125---44830407833.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609914fdaea2d---8392624441.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wodewufukero.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608041844dea4---jifijafopinos.pdfIn PDF document text
    • http://e-sportis.com/images/upload/raraludorisudola.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/jomugiwi.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/94238452911.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce7d1ceda---dejenidaje.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ilohpss4c8pdnqccmj0pool0cp/40923405570.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051003265073499.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/xesisigoruralosiko.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/43ea1d2c46c6dc33295ca2d40ea7901d/48756910220.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e739cc1---26523140892.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb2ce5a13---93061602279.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608455abc2baf---xikofitus.pdfIn PDF document text
    • https://luminex.pl/upload/file/kivuvekovineme.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/pulepiwavuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=setting+of+the+pardoner%27s+talePDF 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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 16924 bytes
SHA-256: a15cbb6ae427e58379714f9ea4143a634a36084e34afd45341e0a28d2b5c63d3
font_02_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 10888 bytes
SHA-256: 0e44fe94454e0a1da772e21496f38d0611aed0def630561a21b87e36972fafa3

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