Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c71737f7fcd5d0f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 14:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b142abcef438749696322a8e28a16149 SHA-1: 238bec5a3e6aa1c70f5f5a9f85854b75e9d27f5c SHA-256: 1c71737f7fcd5d0f1c7c49fefadd1042806c9c084b1ff6dea01b669cc38851f8
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters suggests a tracking mechanism for user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=foreign+body+in+lungs PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e98d3aa09---wutonazuruvo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/dab1d74a2f13824dc83ac24a0bcb833a/lopupabanitebuzonajam.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/13359625653.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qp6n6v8kkbi73oul8aik8kdnvh/78286172993.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/bugidikape.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/kumilugilapuvekotigav.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/mesovaxetuwurin.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/sud7preksudcdf7r9rfbke6neg/tetipegewokadufuk.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8vajf0bsn3oc9ip4n1q9585163/15461689763.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0ea3718c---90800965189.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/likipegulonokalitekunuf.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846e6a95d26---tufakolipopowot.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edade88ac---48898394356.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/zadabigavalanupipajojid.pdfIn PDF document text
    • http://tfforming.ru/d/files/gifekefe.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce45e28db9b---72143376652.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ded1b7178---nevamedamu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a51bc90da---70399872799.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f3198718856aefb82bcf7322b77beb/mosorele.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/63614325620.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bd09f7e42f39fc6e48a39cdca15c1143/waxujo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160964d1d55dc2---79986054454.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/1511136516.pdfIn PDF document text
    • https://scalper.ir/data/files/file/83513748111.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d6113d79---kimukimibiwipotobaluseza.pdfIn PDF document text
    • https://medlineplus.gov/foreignbodies.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_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10492 bytes
SHA-256: 5a440ad8399a528533061b6199ee4659ab654bd943b61942ec666980254d5682
font_01_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16676 bytes
SHA-256: 8fee51ea87ee8722ea71bf8bd117808ca10906322415a99fb67f3c60e81573c2
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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