Malicious PDF — malware analysis report

Static analysis result for SHA-256 df29e95405fc28f8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 06:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22a95f61df42e5544ea82430f0276dcb SHA-1: 9a7fe7d744276c1932e13362a91f6c42bffa6c73 SHA-256: df29e95405fc28f8b30c508b8a3b00ccd4a419acc0856585e8f376eac9ac4e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external sites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://lifeteacher.tw/uploads/files/202109010657014726.pdf In PDF document text
    • http://likebarcode.com/image/files/20210907_061422.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/fufuxuroduzusikaxixedewi.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/wiveluwuteturodubezili.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/79499159266.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/86454280954.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/140947505502.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8176_20210920083244.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gaxafekopinuromaxigepav.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jd9vslfcctboguabi9rrd0fsrv/81923124664.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613487de3ada1---45080017110.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/kiwekimomunufaxatulo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587dca9293---83420877046.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/gijotuvivavixolem.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4113683c9---45307457498.pdfIn PDF document text
    • http://bubb.cn/up_file/file/pupuvubenigifikajeguwi.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/14755815278.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kotefapekufata.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/wivazo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/nutevobaresafuwojuf.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/119597869.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/47604891972.pdfIn PDF document text
    • http://househouse.it/userfiles/files/36453866795.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/75211278148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+read+apk+files+on+pcPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 17712 bytes
SHA-256: 36ba326728773f9e18d8ed35f0cc6d95a3451b3fd70737f1b3a5b36476bb7640
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 10784 bytes
SHA-256: 222927f0ebafc04794c1bbfb5233bb9d52354ed51a040e3f21e7f919842c4813

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