Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5915f84473ccbe…

MALICIOUS

PDF

100.3 KB Created: 2021-08-16 01:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5b8c318ece16bf477125965508caf0a9 SHA-1: bc1f1158f4e70ded181caced0268116e39dfa5be SHA-256: 0b5915f84473ccbe8a5213eb4af8ce7bb7bbd9d5d11b683f8022eed34d4ae9c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/vokatexevaz.pdf In PDF document text
    • http://broorybulldogs.com/clients/33993/File/98224253757.pdfIn PDF document text
    • http://alkanboya.com/files/file///10716805957.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/rakuroridugapo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc6512f9fa---48646409514.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/78862001405.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083397ca0613---1966748039.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/47239690360.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/6691235522.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/dd5e203e7737a942a2fa074b2fb14fba/1357143905.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/iegokagl84hj8gfp16ooc9ranm/vuvanizozareligozub.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rsg633volckfmublgrl4a5tu57/wagejema.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0c3fb81b3---mewijax.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/nibixivudizoputiluwon.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/dujofapa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2918a2db---kixoxisoxakevenidom.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/vezisomogulu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ad38e581---vakubikifesatiwizikenezob.pdfIn PDF document text
    • http://raczcsalad.hu/files/legekibebixijevabud.pdfIn PDF document text
    • http://dnepropress.net/files/file/65361584756.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/xafulujupomolinukazip.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/57082446545.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nt3qet7qsgdhak2cr94bro64r/10641745965.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210723_7DAACD9DED3BABA4.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bdd223b41973c3a33d0aaa9151373b66/38185611819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=shortcut+keys+of+microsoft+excel+2010PDF 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_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 11112 bytes
SHA-256: c14ed5472aaa8f9e785a28dee01b69fb28b82a05fa929d4b49e924ee322da6dd
font_01_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 17812 bytes
SHA-256: 60145ca9f8723af1250f0ce1ff1961f584b5cf77e33dccb269ba5792779316c1
font_02_sfnt_off00016a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1