Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7f70331f72fc34…

MALICIOUS

PDF

96.1 KB Created: 2021-09-02 08:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc52146d7a966580cb6bc8703034fc66 SHA-1: 733ffa01acdfbeabd007943095b785993e50d20a SHA-256: dc7f70331f72fc34e2312e26d58c448c61b84278f4adae9d457c9b234881f87a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0aa363f5bc---selamupifufexipo.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f83b668e52---56728416218.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/764aac411aa6b6a443440a9eee3b9b53/zedamotu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/jimewo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae54d0863---13458986307.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/edd64c7478d2b01c2d1edf5210d7ac5c/16822909162.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/dirotasiwanug.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccff445034---folepog.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54f56ecc---40943633620.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9f75b695---davisireva.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/032ca62596085ac8ab94974114574353/gabanogezejutiteni.pdfIn PDF document text
    • http://dztechfin.com/upload/file///xalibuja.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/15194091366.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xijuninamalajudafibi.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/xavazafawi.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/10227079210.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ae01ee634---20930882214.pdfIn PDF document text
    • https://zzwgjx.com/d/files/zejopewadazepotigabuzuwif.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94994832537.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lipunuko.pdfIn PDF document text
    • http://chamdure.com/DATA/files/62786844570.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/96100961066.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/futoxema.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4858d09c---87878553449.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/84322634796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=create+a+straight+line+in+photoshopPDF 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_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 10560 bytes
SHA-256: bd5aea9354a3b3f22c96c136b2ff954cf6dabbad5c6d715fcdcbd4617f671561
font_02_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 18460 bytes
SHA-256: 9f4d2a25f16fc2ed6567f805696c92f93c98f6b2f68bee35da3ab4532247ad0c