Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a9dded88e773d8…

MALICIOUS

PDF

95.8 KB Created: 2021-08-07 04:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d36f9db5493b890740d7f828eec4f027 SHA-1: e0d8f5d50e11d11702830d7830ffc86567c81c22 SHA-256: 92a9dded88e773d8fc5610757f9e55284cc5e15809ffd5120a7b4da7ad7c1c4a
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf377d1ed5---28199112767.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962d8f419d---29532416731.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/tubapax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a1a78c1b---lozevututisutanofebimutal.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/s2r6r7n8ts3jpkg59ptjm8c168/31053593911.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/13185438938.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d72f35be---59569237022.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/81770678206.pdfIn PDF document text
    • https://pellevah.com/upload/files/32873067863.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b489e9f74---xesogeguzafuligenabez.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pokewera.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ppsh8u6s8djsit7o7jq69rfrng/59090300100.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094116002f1c---69012363847.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/90225543914.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/zofij.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f00c0c2b89---gotilikujidofajenix.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/33015821934.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/57000550015.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754da15208a---fojufelexapatuberod.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/sapogu.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/lipafurorojo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i08b9d9ncerpe22iuf3c3hcijr/19612783421.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/matitegebizejara.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/81440764479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=los+siete+h%C3%A1bitos+de+la+gente+altamente+efectiva+libro+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 18444 bytes
SHA-256: 72207df268afb56ee114f6eb22e6366d29a0ebe5618e967d685e049ca9f33cac
font_02_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off0001530a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530A 11264 bytes
SHA-256: ff309643b2aef3091b5042d437ee6c003a64b153025c66361fd2ae2399d0894f