Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9e07f64adad845…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 10:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37463093da88cb55789189c65245772e SHA-1: 2db0cc76812b832e44146e82035aa0c6ae69e640 SHA-256: bf9e07f64adad8459750a93a9addc3de5ef21a0d08633da9f3cb59125fe3044e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect with a remote-support tool, a common tactic for social engineering. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised or disposable hosting, suggests a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fiorenzuolatrack.it/userfiles/files/79499928321.pdf In PDF document text
    • https://horizontire.com/userfiles/file/11326877090.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/kakin.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rudevexewafak.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/mekivulaxonebesi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8eb75b81aa75b6df530ea59d4d751d72/kefikigurafizikan.pdfIn PDF document text
    • http://grupophi.es/uploads/files/76800233791.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/53186724047.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/terav.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xaxukalebe.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kozusiriresizadaw.pdfIn PDF document text
    • http://dytac.hk/userfiles/32068030060.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/46019739548.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fee71dfcec85aa8ccf751501b2eaeee9/76501084912.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fitufefuragezeruwuk.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/43bb352e259a38f721bb5575df093293/62904956911.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/89498433979.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210908195830.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/98408609231.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_84D3739D8C6997FB.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/6004396451.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/40705a7976d66fae3d06519a479fb3c3/10873810346.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/bisiwolatolexivapesejivof.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dapuxejitopadobu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dinujagexadedav.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/50314851453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=remote+windows+10+from+androidPDF 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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 17224 bytes
SHA-256: 7fbe53476f9d693788844c1fbe1d530892f986c849da54304774f6d23a4019a4
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 10772 bytes
SHA-256: 2c914727c4c63b904fb6bd750afdf593ab03f97be72af500eed5b9197d3c70db
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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