Malicious PDF — malware analysis report

Static analysis result for SHA-256 6183810a4dd57e4d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 07:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ad7af1f927a07d6089c40ae079c5064 SHA-1: 21ff1a1dc4b4efe84510a57731a9aea0f22fbcf0 SHA-256: 6183810a4dd57e4d12e482ab17174852f3607401f8b615ac4db9243f0c108e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thuduchouse.vn/pics/file/kolemirifarijovutose.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/feladogumezupe.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sufudegivi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4616975c8c---90845954851.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210819_2108A3333BA0AC53.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/todasepubuwini.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tebazowuzudurenoj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4283c12ec4---57301795611.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/xomopijanopo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffc492bed6---2312124660.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/34076303316.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/j3qo0kn134puscnqpjbfgbgcq3/81422892617.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wudugidofatefumo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b294852b872a16e6ea03cb0221c2f47/72250182683.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///buxawiruke.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/roxasuduzub.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb322b48ef---93739977049.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/saledokerosejuwawot.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce07d10731---51997739280.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/91027554086.pdfIn PDF document text
    • http://millecolori.it/images/file/petunogexi.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/zafonenanam.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/xaxiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=keith+haring+politicalPDF 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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10476 bytes
SHA-256: a108307d0f8a3db5b562fc308ea7cecdca26ae5971e4dd1c0759d61cfec7e729
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 19072 bytes
SHA-256: 3e40332e9c4fcfdc5552d0c4658ed33dbaa67e581f980621b91cf2df90bc6d1b

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