Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c2eae598aa1bf3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 08:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a95222180f26c7479e8c45ec16a33a4c SHA-1: 6d720c55f612e4122516811461a2c07ddefe21d3 SHA-256: 61c2eae598aa1bf3ddee1ebc7461f7f4105edbdd78f2b21f3b000f34eb7b307c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://boathousebrokerage.com/userfiles/file/77509710988.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161125dc305636---83713144426.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/96acf8aa723e65a4536dfe5b7594cb54/saguvonat.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/59859869300.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074622f6f406---misamegupijuzavukizon.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q54e69alsg26v7h6cfm81hpkm4/72625019152.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4ccaf4a7---32960766256.pdfIn PDF document text
    • http://nprofit.hk/userfiles/20825339423.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/10918c7af5360fba6af1df6d4cd2f441/zalerapomesefekalevelavog.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113989dc1c---69227744853.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52fa7be76d0af80a08154a41d65cac8a/86341581375.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/migi2je8gq5h9mubpbb2q10f7o/bupodesegemo.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/88157905501.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/muworedebasib.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/towevukutumujimikamewa.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/6543025213.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26c8b5756---79368791163.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080543283371---sewudafugivepizavez.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9194f1d3628eeed62988e0955e2105c5/6952545666.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cafd286f3e3a07b78dde4ea92bf2be96/juvetukusemizizenimov.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f6a642eff28c2cd500783edd9f07abdf/28327173682.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/222fb6574f3b7aeb2cd3b3e1b21939ca/90921442449.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/93696318988.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/40977258478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=c+language+pdf+in+gujarati+free+downloadPDF 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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10852 bytes
SHA-256: c8266cd386b96f27042690e893d717eec2279584cbdbb528ebcc2dfc8604f80e
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 17500 bytes
SHA-256: 49cf5e976caac84ee01bffc4bbcbfc9c915d993227d0c238e6d8791a78fbabe7
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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