Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b06ce72ca643f0…

MALICIOUS

PDF

80.1 KB Created: 2021-07-09 15:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26c81d9c6498fa9746cbfdfef65b0826 SHA-1: 6274cedfe2919c64620fdcc20a7a386e0740e04a SHA-256: 79b06ce72ca643f04918fcac2f6249df171a613dccf2bac704b2dd3087b77e2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is minimal, with the primary function being to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160789f145c49b---mewibevebe.pdf In PDF document text
    • http://mengnuanua.com/app/webroot/files/files/gefogibirele.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/webexuk.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/28206924368.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/mironowomekukazafubolisuj.pdfIn PDF document text
    • https://xigmatek.com/upload/files/fukotewigoviveka.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bcaafbda---26863295609.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/tuludujurabetasefe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db60e7f94---71438477211.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4kjudj93s29ctenhp38kmnj9qu/53754179993.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/94515152434.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210531/file/33907529091.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l6p79h08l812j50642oess2pr1/2024243518.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061622453620.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709f554fb---40559552106.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rehdk6hgk9pukc473g9hgevav3/mivepamiferexigim.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/87725980549.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/46752793809.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5ea9078dbd6f08c48e592cb17e759dfa/25270936972.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bc8498851fa49f0e437a2b6a3ce3fb1b/mokubezevabezapawoveg.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/80712834622.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/5117361250.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740177889bf---67878103862.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed0082648---nitemipajapukokev.pdfIn PDF document text
    • https://hirurgija.me//files/xekegenake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what%27s+a+hunterPDF 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_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 17028 bytes
SHA-256: 578a76ed47c7b6a231a73628d533a728a377363084ea880f80165953b545689c
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 10076 bytes
SHA-256: eeb1eabd633bc316f040bdaa70accfd786d3b340e2450e70e47e4b26d3fd0942

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