Malicious PDF — malware analysis report

Static analysis result for SHA-256 722cc9f7e476349e…

MALICIOUS

PDF

78.5 KB Created: 2021-10-07 22:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fff4b3bcc37a39fc0c1d385b279bf97 SHA-1: 98e4fc8b2027a939b2db558232b0badaa6d81876 SHA-256: 722cc9f7e476349ef114b91c96fee571098d2efb767c04d6cea01a28df1db3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mbjarrahi.com/UploadedFiles/New/file/47990213411.pdf In PDF document text
    • http://kaus21.com/userData/board/file/wisawinajazelusafawel.pdfIn PDF document text
    • http://apicn.net/upload/files/18896122572.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dedawoxorini.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/riuot8ruh0qkufep1giu6h60ks/kubuxaxusosanumesi.pdfIn PDF document text
    • http://guowangcable.com/d/files/fasedizaximab.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/teferinofasarutavugi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c801ea8eacf4ba9572e8209ecf11c5cf/tikovojotoveragigolotar.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/58692400659.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fasawajinalilikexubow.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/zawiwob.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/42730686152.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/94509257689.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/97936434902.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20211005000617_oz6m11.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/4862562927.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109030911386381.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/sonumorefubulixexolafuja.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59815933911.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/99745542705.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xurojifodusesu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/malokivexepuposuliniwe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbc8ebfca---21205651138.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4b807105---80734273802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=custom+css+for+twitch+chatPDF 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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 10536 bytes
SHA-256: 9f3243a2495e41d87f26671f6f7e3564f862f6fd1e7b3444fc28733cb165a459
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17584 bytes
SHA-256: 4d8a99107dc5b887a200cd82da28748dbeb306393eb1ec8d0d08a1e5d16fc5ba
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1