Malicious PDF — malware analysis report

Static analysis result for SHA-256 e337ec22d3261385…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 21:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9fe33043f58e6252498679c72f9ad67 SHA-1: 5c5f81d99a58acc3010169bd63da04119cc8a832 SHA-256: e337ec22d32613855be1ae88d2c13ff8a2dedab2c74a2cece00c811682a45aa4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous links to external PDFs hosted on compromised websites. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect to remote support software, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+to+cast+my+mobile+screen+on+laptop PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ngpe02p522ri9lnfbeqqbd4na/temolimozot.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/84153176317.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/88899620460.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81577827669.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/jurulaxizavakukonube.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/datomowugiwewutoju.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/xuratilikuv.pdfIn PDF document text
    • https://protum.se/file/87980498407.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7v753na0gmpf22hltutnaunm00/59060481555.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3449916068.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/tiwojokalelaf.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/78569866771.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/fipumov.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/gefazepa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jurajaxakub.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/javekinalelet.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/46661144114.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613696e674f8c---pijod.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/vikokazomulefodope.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/20788576695.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/20000331986.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/22086145034.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0b9b7713---butedumevivi.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/89836223431.pdfIn PDF document text
    • 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_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 17672 bytes
SHA-256: 8e002d2f5bc8130e365230d4260686d8effcff2be4b4836229c8895f385b877f
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 10868 bytes
SHA-256: 984f1f949d482e2ec5e1808232ba2e208507588a33af30ea5bb2d3f7506c9eb1

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