Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c2053dce8c2163…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 12:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90d655a9091127c9dd44bca068bf0891 SHA-1: 74239eaeecfb249014123318af106396bfc37ce0 SHA-256: 64c2053dce8c2163be67916a712e470b5446f3b923d2a921efa43fdff906bd0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to various compromised WordPress sites and other domains, likely intended to redirect users to phishing or malware-hosting pages. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure, potentially leveraging a PDF vulnerability or social engineering to redirect the user. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=nude+ombre+almond+nails PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6af30498c1bc1ca999030104396176ad/25754868768.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/47312314486.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70a21663b---23636268555.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5dcc7c78df6578644e1893d5a526a6ec/gutalawikovikipu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/50141f5a34fe74ff894630c632ff497d/96999612932.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/48532649652.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/lizawuzezivub.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/pezezunubigemugufuz.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/03aca616b5c067efe3ab446a4966f66a/1502725345.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jh4nci4mf0us57sfmhkeko2knq/20639822079.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7fabb53f.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3b96e113---70022839722.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3673e1e7a9---19064701984.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pi6i9vnmcna8m1oncjo7cggmst/mepip.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f85a7406d---56091444880.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/aqb1kmt2asgk1dk1q0tck2s5he/1431865366.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210602_3EB6EDB253F024AB.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7d540791e655c89346abdaab28b91f85/xanobabakone.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/69633517469.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/19323280148.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cebe29c8---noxeripimokozofedavuwuz.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/voxojetesuwutoz.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_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16436 bytes
SHA-256: 0a43cb38846e861c819ba64d0a5d9d41449495c314997b12733e2ae694a44749
font_01_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCF 10528 bytes
SHA-256: a9e1c24359c0ca460687a2264f8c057fac20afe81a7faa36c22acaebabd982d5

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