Malicious PDF — malware analysis report

Static analysis result for SHA-256 9192cb2f9b2b8485…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 21:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9e27a3749de6d1d83a09ffe8c3e788c SHA-1: d176d39e73bad3c18be673f16513be7a02e1d903 SHA-256: 9192cb2f9b2b84850ea48418229132d57a45f7be94a5a8be37d420c1ef896780
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect with a remote support tool. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to distribute the malicious PDF or redirect users to further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://restravel.ru/ckfinder/userfiles/files/78255634665.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rrvdvjh809rva05tgc3jq61p72/walozolidinagut.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/mogubebawi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c1384e2a709f44559e5614dffd7b4af5/51969328039.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f64nlf75qa2a1duduc046dd0j2/42059856859.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/93801873275.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/fuberaparesik.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/im6200nhc2ctadvs6qcr62ssju/lubadexabozari.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/98547642607.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/90408205199.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/17061377500.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/suzitiruxematu.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/sejoxavuximomo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8499192fb12dbc53b562e357db1b1485/gejog.pdfIn PDF document text
    • https://drlanda.hu/user/file/5753037546.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/32948912529.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6c9ddef79---86751682847.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/zetebed.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/22239120417.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/68475187113.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ba6f9af4dd9e42b90db48bf1b586f43f/vuxekamazubokuvudewise.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/50144103312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chatrapathi+video+songs+hd+1080p+free+downloadPDF 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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17048 bytes
SHA-256: cbc5acc9dff001f8e13a238cba4878fde6596dc1393480756c67a88c5561d0fb
font_01_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13531 11344 bytes
SHA-256: 813bde8431604e784997f70e452ce5fdef2384eda3c1a953b4f7fcbc04449d60

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