Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f462c7933e41d7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 07:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2b44f4b8a60e8a3e3ef397cb2939c76 SHA-1: 89ab6b20fafe1e931b3ca3e94959d05c0dd7fc8b SHA-256: 11f462c7933e41d7f256065addd0c89f0fd2f5c53a86bbb3fed6105cb45613f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malware or phish credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/xonizubuxobepababawaxi.pdf In PDF document text
    • https://goldgreiner.de/userfiles/file/fugirezujugojazivamiraz.pdfIn PDF document text
    • http://cosyromania.com/media/file/furud.pdfIn PDF document text
    • https://asken.as/bilder/file/3721444945.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/xegukozoginonuwe.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/50571443861.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26547046641.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/145bd225cce601cdea1c4807444d2860/tirikadubojesolujodosetu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/44870722074.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74081883054.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b0c971cf---fenijowibilij.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/92904626115.pdfIn PDF document text
    • https://khanikango.in/file/sizabunekutenumaba.pdfIn PDF document text
    • http://cwesp.biz/upload/file/gebubawexebetade.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/15354740234.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/57834764970.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210905_102510.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jimanipiwetejoku.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/33643132760.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dcf39c2573c38061f468185ad6bf47b8/gusukifijexukimego.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137396ac2484---95700654452.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/daloriwidezu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376e376dbf5---tawiratujugenojupuvesoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+fast+charging+apkPDF 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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 18336 bytes
SHA-256: ad447571ee4648a35f8d0f6dbc8f831a1c725989d58ce7f1ba92f6c1cbf75b24
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 10944 bytes
SHA-256: 6681c2446db331147ea07bcc13cfbbff64271936b5e4e332f29bdb37401d2860

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