Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5252eaa1a353bd4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 05:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5913b21a8ba1b253636616a03c84d70 SHA-1: 55a3df09867f5666a695b92e3e183732441b4e8c SHA-256: d5252eaa1a353bd4f5fad768b2f86ecfb27147740d2ffb4be3cdb460e615457b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or phishing. The file's structure and URL patterns suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e3f46aec---joxuxopegepatigurizora.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210531235930_162751892.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/68jinihtm697c02un55alkkbp1/nuzuz.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/83332407553.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f43a92508a6cb1f33d96a531c2e9bd76/xukolivil.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/laxoroz.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/35987361032.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b094e0da6b---12632687556.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/24365737952.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/viwozunimerivefumutiv.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/98098178635.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/jivenexunemowerukotobetak.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/89960846547.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/55buabdv6clvs3fi2id4vir2ho/25538722029.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/557c4595e29bb9ca9291e900d514d79b/70949730526.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_53E4487F07A5163D.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a206d63f---tujotisejaz.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wuxozu.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/10156134841.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/30507308474.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/35508186407.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210829_D37F0A0C02DEA584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pit+boss+austin+xl+manualPDF 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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 19036 bytes
SHA-256: 37bda4d72326268d970f21670b3e009026fd1563605470a88c4229db5507e5de
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 10380 bytes
SHA-256: 2057790ebc2e4ae419f913f32da2321846f4bd32b1652842ea61c9c9b083adf6

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