Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60350ba0147bece…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 625549d1b2dd907f260bdf4d1afd44a3 SHA-1: d6cb8b612c20dff187752c932620174671b5a172 SHA-256: f60350ba0147becef0771da293f87795361324f255b6fc5b15525f2c1164079a
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://eastmangroupllc.net/ckfinder/userfiles/files/deletijujiluwamujog.pdf In PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5af4d7eb28be930a998fc571ff780ea2.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/24565201867.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74898533987.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kituxudusunibaduxovivu.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/votisalapunijugokexik.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/89026925118.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a95ed7f282660d523c1056c9fde39fbf/53276916883.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/89750867249.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/23472177140.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/61390905593.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e1a602190---9735574630.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/9767932369.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/kulirokigazetasiput.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131331b195b0---tevevabajunekaxef.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/dikaximaxowiguxalezel.pdfIn PDF document text
    • http://mobitransjogja.com/files/35944514359.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904ce7af24---56435816456.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad1ba3d6f---1205089842.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/63384090879.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/fizabepenip.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/navunewozabetoxoze.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/porisasilabawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+mobile+for+android+obbPDF link annotation
    • 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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 23036 bytes
SHA-256: 8f334ef38b9929ab0b46530000def69a8b08dfd41ba9dbaf7ee52268d04464ef
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 10672 bytes
SHA-256: 9f59ee306130c5a4df4e19ee473efea275925b17fefa70036a59852b74803bbd
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1