Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d3850dbc6ba3df…

MALICIOUS

PDF

119.8 KB Created: 2021-08-14 17:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af6187c2b5c052097f3637218b013110 SHA-1: b11518831088f981570f719b8f1ce7276dfc9827 SHA-256: 77d3850dbc6ba3dfadb3e2f3c180eeddf23aa6fa04a07f0c66611233d64d007c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h005k7iokm26jh834juog5mpt3/musefiv.pdf In PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/paniruzop.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced7dccbef3---wuwejijenadesotapudedoki.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2fc2f214c---penonejofadek.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e50d37361e7---nogaxef.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9af8d8e2d406ceb8e1eaa3e2f4ff0495/29016626300.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xapekiliwejerazexam.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f628fb7e85---44297907732.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gpa46snuugm77tukrlls22pekr/niponexogomoxunow.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/a665nsf86nn3utst07paj8miqn/33319960750.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d55a17f77---rujejokexoxazukikoven.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/togupizezonisutezop.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc165d7ea---rulejarubexov.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/rosiguxupexelam.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/53035fcec901de68cd395219074f2bcd/tewep.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea75188f7---telidizaxuwulokixovumek.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d32e2efa---40070675509.pdfIn PDF document text
    • https://biocoils.com/img/file/mofepelogepilozopuzi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fpvnt5rkc6vrrduoddgrc2k3r2/81915285281.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/jofanerixajodarilebadote.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/rebibobogowibara.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/q7c2vpau4n1n4v8ot81bd9m6s5/kexudururabipimiru.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/51530746370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=iron+alchemical+symbolPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 10604 bytes
SHA-256: 1e382a906c03a3f3aca132eb1ff3e3231516d5873cccf255eb7f65b991d08dcd
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 57560 bytes
SHA-256: 8c6eca77c586431d31378267c8e90bec9ff58017fd3534eed4423f67222c2a92
font_02_sfnt_off00017bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB9 22696 bytes
SHA-256: 61441efa4a82770cc12abd2cd6fca613d8ad8eca83ef5a250f933069200611dd
font_03_sfnt_off0001b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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