Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d762fbbc5bf3dc9…

MALICIOUS

PDF

151.5 KB Created: 2021-07-08 02:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d20130e52b1817e2ed464e87c8aa47c SHA-1: 7b2990994e6e53546aaf46ea554d062a33142d94 SHA-256: 8d762fbbc5bf3dc9b4da6926806624c607d4f7f888342ad876cabdcb1e424afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://darec.sk/files/files/wajodav.pdf In PDF document text
    • https://valve-toho.com/userfiles/file/26101471835.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344e54f3c1---48894567899.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/49c04a888fff425c764de1bd38d158c8/pivuvulomozilajarevowere.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/31772346346.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35dcca0335---ronolijuxogasatovo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5d05bc236efc9e90f26ae3cbee269f07/ravawamumanomukexodapa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/1addpdt8ulujmktodcgs3hd5gs/65670645203.pdfIn PDF document text
    • http://yongqingtech.com/d/files/62068566703.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/76235390304.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d19c48f0fec---34153783485.pdfIn PDF document text
    • https://85097781.com/upload/files/84501573544.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/fakilutomazadeb.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/27144254084.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/tukorogibopaketuxokaduxu.pdfIn PDF document text
    • https://tajeer.co/userfiles/file/33069155526.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ziwowirif.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/goruzuregakipevo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b037b435882---roxof.pdfIn PDF document text
    • http://chinalabware.es/d/files/dinizefeluteto.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pufisisozofagobozelaneno.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa6b93906---80562746022.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/b73631vlkrj5kh567trmhr3mi0/napenidisuf.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sais2151k2730quhqn7uc1mkh7/81613905054.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48879b8a1---zedelunuvuditovuvu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd11bc3a07---21063136006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=biblical+meaning+of+dreaming+of+a+peacockPDF 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_off0001ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE56 10984 bytes
SHA-256: 87f20bb1fb7f712f4308a2203442e0072a77fc543a54f4a3a2acda1eefe8a722
font_01_sfnt_off0002075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2075D 19484 bytes
SHA-256: 268e959941ad9ef51ca106ef36e65174522c3e6f59c119f44bf89a6524f31807
font_02_sfnt_off00023825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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