Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70cd0856e2f8b53…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 09:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8eec06b0110198608b6b6541f17654e1 SHA-1: bbe18bc2eea3ef0b308563b72c18146285604900 SHA-256: a70cd0856e2f8b532d7b8007f6cc886929a37459d45d05c939a396b1b56b63ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'Urgency / deadline lure' heuristic, indicates a likely phishing or malware distribution attempt. No scripts were extracted from this sample, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/butcmalsrpql1o13rof1vl364o/nutawuwileseratad.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/16fdaaa5caaf5ec368d88ee4ab2cd5f4/divufejufavagivugijaso.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c7a4b2a40edadb57feb12406cfe29e8/65843749016.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0cc761ec7d9431edd6f5f770867e0adb/27612331976.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1a983121---55685455478.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cb8f9e14c---mufubusozeraber.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43d245e5a---rumexebunerotudikit.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/12763815522.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pubemukimozoz.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/37870823410.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/zaxotimabizijomedid.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e99ed989d---rosim.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/bugupejogazojiladusefi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg2spve9om4m8qfq0bthk0jrbo/zijulodir.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7a29cc0b---robiredefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe2fe344b---malusirikavomev.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/40679442013.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711215628f5---33277926321.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6f029cc3154f7a1b041f88d6a78717b4/45632048702.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dlol01fe14ljokka9hlnkm9li4/44878621145.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/3829267690.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/fenovidijosanuzu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607118c3d4337---55071174941.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a6dc479cf48c1ec37537403c7ddf989/69127454504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+append+pdf+documentsPDF link annotation
    • https://medlineplus.gov/appendicitis.htmlIn PDF document text
    • 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_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 10720 bytes
SHA-256: 8696527145c253214facbb6a479bc6833b5b1ef621c7b5dcfa6c89bb3f621eb8
font_02_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 16448 bytes
SHA-256: 3da59ff097616f824df239b23fe605991cf61d741ad6369975a013958cc1fc74

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