Malicious PDF — malware analysis report

Static analysis result for SHA-256 72776b559506c303…

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 06:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 007b2830c1b9a9aec338107cbc7fad81 SHA-1: 7e4f51fb319e87f43b8949224c796c1ca3de02c4 SHA-256: 72776b559506c3030a95e40b4bc85cf385abeb518150a166602837f14187c765
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://opuspointpartner.com/ckfinder/userfiles/files/jizumapawinopoteradurig.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/ruzudabonatojo.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/6169379646.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/vumufidegoxabuvij.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be1880ece---2896724549.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/36547590255.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xotimeralizesanuke.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/14467722309.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/067ff333c2a513a0a277dc925a2579d5/tevitirulomuwa.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/korubemilifuxovas.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/buvisikikorerivewada.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2bee59c7c---nomajilesiwamafi.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kezezijusuwifaka.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/ravolovowagifasase.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xosizexipazozoxapegajur.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gizapeluranex.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xuxemalo.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/pototaz.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914182942707353.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/28333009521.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b082964fa5030005449ca1931edb9419/jowuzerutopomupidegesukes.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/larawerizuwavenisa.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/toremob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=remove+password+android+phonePDF 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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 17620 bytes
SHA-256: 46ed1f1a280c788b518dae18094f80c067dac030a487ecc02d22a4d459ad8920
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 10712 bytes
SHA-256: 9378064fb2a6e1dcfdc73852e027a791e94127dcc33fdaacc7139e7a9c4c0420