Malicious PDF — malware analysis report

Static analysis result for SHA-256 72850f50b966097d…

MALICIOUS

PDF

96.5 KB Created: 2021-08-15 02:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67b91721e58ac35ef1bc5f623361aae0 SHA-1: cfa524fa687e6f96f5d29f1e8f75ed9e7bcd57da SHA-256: 72850f50b966097d7cb63e8eb7c7f05eed17944acabb05bff840083bc950de4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3576760ba8dbd4203b452c23508dd97a/86692766267.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b25bc4047430ecfff2ea7594e1962269/miwudiwomowudesuzozilu.pdf
    • https://aslimitada.com/userfiles/file/50659896960.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d8c137782ab5971e696798a9899a3a76/jikawugagigirutugamusob.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/277b35cb0aa2b5b1850896d7613b3cb0/18140639354.pdf
    • https://goodline.by/userfiles/file/raxizinoronuwofa.pdf
    • http://erdbau-rauch.at/24334063461.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715344dfe8---65442460844.pdf
    • http://studiolauramoschini.it/userfiles/files/zopizu.pdf
    • http://agiusfuneraldirectors.com/files/file/36633121614.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8h3p47276fnrip3mq1bdvn6v67/90720195763.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e04ac368c0a0694243752933d2690263/19620826572.pdf
    • https://scapetime.net/images/website/user/files/mojebikisixuboz.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4e8421c7ed5af13f89fcce60a633a75b/91714567962.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/juav2bfq1ndocdau6c2ig7co7n/94934610784.pdf
    • http://kapelski.pl/userfiles/file/modadipupameworabafetuwil.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/zakodiro.pdf
    • http://fly.no1-yes.com/userfiles/file/97331791190.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/16716759.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76b833582c---25981910015.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/25195886579.pdf
    • https://afayl.com/userfiles/file/zekavize.pdf
    • http://varosom.hu/userfiles/files/31428428073.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reset+a+toshiba+remote
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ae.bin
c72b62a3521eb5aabab6c7f2ad26bfc58c6934ee01214641dac57ad60f80e289
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 10440 bytes
font_01_sfnt_off00012d71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16792 bytes
font_02_sfnt_off00014583.bin
5418cf054cd50ba7ffbe2cc9dd24f03c304cf476840cba9fe4309731630e07e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14583 17604 bytes