Malicious PDF — malware analysis report

Static analysis result for SHA-256 89aa7d1c789ab75e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 11:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8777a880bbe60c57eece489300fa5d0d SHA-1: e1940815264bf3b1b7b1aa13fb76b09082a1c4de SHA-256: 89aa7d1c789ab75e86ae59d73339bef66cca6c5720dd546c434becfb299d008d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent, flagging this PDF as a phishing trojan. The presence of numerous links to potentially compromised or disposable hosting sites suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://songiadabinhphuoc.com/upload/ck/files/59859869300.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/nesenokikipunogokolovele.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-20/20210820053132202408.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/ganinixifenevipowivawivub.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/eb418c4a604f83f4a3a6bfea8da2e42d/57314731303.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/94267641665.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/20454272955.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/zusini.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/64957584675.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/jerodawodariturur.pdfIn PDF document text
    • http://mutitar.com/user_img/files/sarufajekugoxup.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0059f72b58f247239b9c055a6873eaec/16317376167.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/13kntgj891h7hlf20k563b0pr5/53230089335.pdfIn PDF document text
    • https://rcot.org/userfiles/file/minizawexikexokuluzobi.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/bugufuxizedesinuba.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/30443279238.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bffb5689---97164020595.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/fijobetulof.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e864bc191a8---96575853234.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdb5e59055---ditedukumigesuwolijewa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6b4e8a2d---50071532698.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/65186045724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=constructivism+definition+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vewukijufebetowolasap.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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 17380 bytes
SHA-256: 91a621030d91099c0cd373207d0ad90a3e97061c3e20a65238bf7d349b6ba2ab
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 10768 bytes
SHA-256: e8abef77d9842c27660942da20a3abdd17c9f2be1e960a8b5ceabd604477f2bd
font_02_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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