Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6557579acb6493d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-18 00:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb949c973a2b8b5aa401af3fa7c1a4f2 SHA-1: 9f36430c3549038f018c52b0903cec225d947c1f SHA-256: c6557579acb6493dd2b942a3f6f68165e0bc4f96f989c3a799a0a5f8010296ba
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely using a callback lure to encourage user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfd667955---46630057342.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/guwizaz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/1139663148.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6a804ab5---dofolax.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972ba0658---14051257038.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06c392f44d---vetexonijarekixon.pdfIn PDF document text
    • http://saglikligencler.org/files/files/85726505999.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b22ae2b8d06343efeac2a4a4638afc73/69793649906.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/58405927444.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/37507126076.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/dukifarigilutaxibimemi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dejenavirofat.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/32042324753.pdfIn PDF document text
    • https://heyratacademy.ir/file/jekuxozuwodipazerem.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c1d47d935d9aeb972fd80e51a04bbaa8/nijowijizizufotesa.pdfIn PDF document text
    • http://mebco.ru/images/file/13268280137.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a910073d13---73270756763.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27c1234f2---gogexamizedaxod.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/mchr48a9jcbfr9utopo3fdtvr5/66060669065.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/16534253818.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/72563241108.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e821baa97---terigagopoxakabekefasan.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe294d32c---vikitesezedek.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/figigi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i1icl9k94715magdqe9u33j3a1/rimino.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075701892dea---bopedurono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=on+q+groupPDF 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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10000 bytes
SHA-256: d253a62b0c7f674aead86444e7d6a7233fba28574d93c0a943db13034adb3659
font_02_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 17304 bytes
SHA-256: ea00531ea6a4b61d5207a1f7bd4c778e9a8497345cb7dcd66531ce4c8eef7f50

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