Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df326e57b0d96b6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 21:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16db3f1c4247851e0203a37263777389 SHA-1: 1713cab9cc1c975d29a688e0b9f5aa5ed5d6a0f7 SHA-256: 9df326e57b0d96b67c86668e08ccfe4f69ab7a4c39fe38da23428e256a3beb9f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=robux+hack+script' in one URL indicates a potential lure for game-related exploits or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sm300159.agchost.com/userfiles/files/81913689381.pdf In PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/93261175647.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/wipoveduv.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc995657c4---melajixaxemaviti.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/68685668083.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210917222117968249.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/42228282838.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210916220353.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/67038848913.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/buzonadesexezenakowebuki.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63748146125.pdfIn PDF document text
    • https://trystsalonri.com/images/file/zijiparudasefu.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/turalonizo.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/moperagasenajozasolepogaj.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/97103594066.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/80039585890.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/34287975631.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/bizusofolilenapoxomu.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/2634437385.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/nikojusalif.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mimawugibinusugorixi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c258b79051---tirojomu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144879921ed7---vekenilope.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/97582468383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=robux+hack+scriptPDF 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10668 bytes
SHA-256: 263d0f0de66e2a09f33213a81ac104ff533ab23b6fe289242a526363d72d53fc
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 18948 bytes
SHA-256: 5e09705f00aad70c77d979d16020186324ed3cff89b9c50b274aea48c6837355
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1