Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e751352bbe2d4…

MALICIOUS

PDF

96.7 KB Created: 2021-09-07 12:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6342e6d764209051216651488361f25d SHA-1: 723721acff24ce8f928fa1a5c94851fb6bb5a435 SHA-256: ab7e751352bbe2d41591103853642ba7fa9b8d634e839931b45fc593e15d177f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The use of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=makalah+tentang+amandemen+pdf PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4pmsf2b8a9g3ugnfq7drah0i1b/xixoboj.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/raxuxejekutiw.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dobizivinab.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/jupafijibawuzenisox.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/84649752116.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86522101291.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/87893305290.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gln751l719or0t5fim7tnbmaf3/kijinawuzazokekatiwonol.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/36004437152.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ba3d4fb044748aa351b815232b7af363/takikimamamojenoziji.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/23353886151.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902035938.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6f4ad1a6980ee9a0bfe5ca950b366651/wigaxisujedabavev.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/18568690647.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/maniko.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/32919632360cc85c352675.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e87815ce---42168179680.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/fufofokolu.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/dovexope.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610342e771c4e---moludufevirobaxiv.pdfIn PDF document text
    • http://ndt-ultratech.com/files/37820539797.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/23877051893.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/434379f9138aec0e01f93b147f23806d/ximebelixulobufutuvugo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3f585bef641d46d1096949c1fa133e28/dekawozax.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_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 10548 bytes
SHA-256: 6ee9b8fd86cb07a0469e1901ac56b122f1460675fd52910df6afd450dccfbfae
font_02_sfnt_off0001496c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496C 16756 bytes
SHA-256: 7ba52d4cc1edbf9f9a8d5a19ab5259bab82fb04e4c08495a845696e2ed3b2668

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