Malicious PDF — malware analysis report

Static analysis result for SHA-256 3748fa21fc981002…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 03:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58b8d54efe4f52fa9b0798211e8bfc17 SHA-1: 8621530c99922d609fc2affeb3be324a0fca325c SHA-256: 3748fa21fc9810023a3ad3dd31b00fe81b26b562e64fc9faf4a81c9eb2b452f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to external content. The presence of 'utm_term' parameters in some URLs suggests a potential phishing lure, possibly related to popular apps or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc93b18ce---jugirumu.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613776aa588a6---57287445883.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/83463198316.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/87526792510.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/31864528793.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/jevabokupuwepulatanaweg.pdfIn PDF document text
    • https://domilot.com/uploader/files/10456067387.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/62238754882.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88099487594.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5d398c31a41a919a818d2cdf1d8f5/mevudifakuvelalugeguse.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/20698469482.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/fatabemexerefuzu.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/xidokosazetisepejewa.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908205303.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/14400616127.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/ragixekaseje.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/27994473615.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e990d11ae5---41630363138.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9472e71215907be68eb5acd6e4310255/77976868876.pdfIn PDF document text
    • http://4bx.pl/public/file/nakugonuzotowovor.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/9864362723.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_071635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+apk+gps+hackPDF 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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 17832 bytes
SHA-256: 9bfa480b8180af4c3cc7f41fa88f94df610d2b8f518899c3c11fef76bc22066e
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10580 bytes
SHA-256: 5faca2affbeffbc9ab6d359a622d991cb43e74319219e1e09cd03682512577ce

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