Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a227ed2ee14120…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 03:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64641ab2f230477574f83f65d200c109 SHA-1: 211c7de958725a0e85f588fe6948ef1f6465337c SHA-256: a3a227ed2ee141205bb6eace4b092823c1064930d655fa11a3daee99e80ae4b7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://pixomot.ru/uplcv?utm_term=romantic+shayari+morning PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ro53ja799461m09k6v11cssjiq/zawidabefax.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/340279188.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/tewak.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/47785480156.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://airfa.it/userfiles/file/midibavopapular.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/majubujixuvegaf.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/dubijajov.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/kazisaminekulux.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/66483595155.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f446f1dc---kedibadewixixufuvukerawu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/30780236401.pdfIn PDF document text
    • https://digireg.at/upload/57609749083.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/femosazeb.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/85567810261.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4301c1d94---xunota.pdfIn PDF document text
    • http://ternovykh.ru/content/file/buwosepokogowe.pdfIn PDF document text
    • http://geotersrl.it/file/42394647339.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ojikolofisejiw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5d9c3ced4691a45c536527f1a3d678e8/7468171071.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/gataxobuzijebimidubapoduv.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd491d5486---torodozifiramevo.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/46820749046.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/juxejafanakosavudovitimer.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b9d8014c1a7d534cfb22147f20b13e8c/41444779066.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/79259453351.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/9130780611.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_off0000c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 18120 bytes
SHA-256: d59f5d37a98bf855fa358aef089c06b20d3044ebe915126b54042a89b9a22593
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10656 bytes
SHA-256: 99005b5b7736766ec22ac39bb8e7711bd9f258fa3e55bc09caca75b22b3da703
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1