Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dcf9999f43d3c8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 01:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71c7a4c9882c90aab9b6449c7e9a1199 SHA-1: 1c96d7915ff053816337a47ae01ec3d90f7eacaf SHA-256: 86dcf9999f43d3c89a0885c0435778b78d3ef718e00401b5a1151fde1fce704c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although 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 0.9973

Heuristics 6

  • 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.
  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b01mf4kl57a1njspjhh5tvo6jn/57803321667.pdf In PDF document text
    • https://kisikana.hr/UserFiles/files/wivafiponusevewovokomoxum.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/25474953004.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4825ef42---27732571238.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c836159506---23381299678.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///25306222784.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/voxutolanu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tukefifizu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/mupovodejusuziwo.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/30418214236.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611920dae69d9---butuwepefevere.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/85nujkq2begrdp8jms6sb859v3/tunovizanolunozovojoxasow.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/92581291030.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b821463f848---23909166025.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rhrq9k5tqh1kfjg5olsc9c0950/55849391095.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/69082314265.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/39141311809.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16302550351759277181.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac114bf36d8---34958333374.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/983fab75d17cd5241b44ded90bc1508c/kokonulumotuxiro.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a9e1c11ecb9df19db23546b7250769eb/tinepififixupagananigajaj.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952cd21b630---dewuturuwamowevemi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ijlqu98b88alk7kndrlfock0p8/katugotilutazagibumasadov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bioengineering+degree+worksheetPDF 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_off0000c20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20C 10548 bytes
SHA-256: 247427d5a3534505794da8adfbefbde366f15d4ae350fa1656be1d519e003849
font_01_sfnt_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 17416 bytes
SHA-256: 2ae50919ecbe694996283a856421a55b52c5afd1aa29adbd142d1c9f507f8e55
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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