Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf855aaa6db515e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16480d1034dfaf27b8b9025fafb36368 SHA-1: 39ce3c65b675a05e26b1da3142a41a6d0d73cff3 SHA-256: 0bf855aaa6db515e049eea77562915a9930a7ded083caa0c3e9df9e496150b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised WordPress sites, a common technique for SEO poisoning and phishing lures. The ML classifier and ClamAV strongly indicate maliciousness, with the latter specifically identifying it as a phishing trojan. No scripts were extracted, but the structure and URLs suggest a malicious document designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b67d0e19---tawaramojesanekojuketit.pdf In PDF document text
    • http://inbeeldt.nl/userfiles/file/79760357804.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085667c50458---wobajirisovagewuzelawinen.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5917b9e24d---56931605305.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/verevajigilixapelumoliguv.pdfIn PDF document text
    • http://araonline.hu/uploads/file/64001630031.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/12399764256.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/cf39d73baecd2262624f26375e7ea002/54248503231.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/11523930302.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23e787919137d25ec6fb71dd956f086e/84651406043.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/41058075653.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/19596798532.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/14564204616.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/44359756745.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3c30701a---71969719890.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/36059030785.pdfIn PDF document text
    • https://marigabung.com/contents/files/wuvasevozo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3d88a2e5---nazeso.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/4150064055.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kks7vio5rrfka9kgb3bpog493i/35846448950.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084206ee4e09---34283133661.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ff9e656e615fd5fcfdbf93fbf0a0878b/52286163066.pdfIn PDF document text
    • http://hncastlecable.com/d/files/92807699264.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///57365758673.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5e58686c95893116fd8af4ffe1b56850/pufujogekipiniburunitugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tivoli+audio+model+3+manualPDF 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 17508 bytes
SHA-256: d13adb92b33ebb2d6a04873767df4f84b95ea12d20cb200d308097d5cd174d5e
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10344 bytes
SHA-256: 9ddc5bb9d8b266860753d205b1fc424b802f597293fa6e0a87f67771ca64a769
font_02_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.