Malicious PDF — malware analysis report

Static analysis result for SHA-256 221fa05be466da30…

MALICIOUS

PDF

170.3 KB Created: 2021-09-06 02:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 011fe34118fe0e5599ff92db198397c2 SHA-1: ba988ed8d27707ad253c5a032fe8c4bb605403ad SHA-256: 221fa05be466da30c8dd238994033574dffa0125ace092863e61088435afd0bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests it may be used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160849f7f0f41b---9754246469.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/47559336862.pdfIn PDF document text
    • http://gibisch.com/files/files/lekepukugu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc91d63bc---16862158529.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adda372ce06---2400032353.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/42247393776.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bitigoxifuwetofizojuzajo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d3252431c---65324281484.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/fibegalubamusepuxozimavov.pdfIn PDF document text
    • http://clingac.com/d/files/36027685670.pdfIn PDF document text
    • https://onwater.my/uploads/file/mesajinaso.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/oof9l462ulev3sfj50u13v81jv/97539729709.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/43155674754.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210804052236.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4296e43c---xotireza.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e1648ded---72313271768.pdfIn PDF document text
    • http://ccsl.asia/files/61492134433.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/9456543609.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/64705284672.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/wirutaxokomazikosiwukozib.pdfIn PDF document text
    • http://cartopack.be/Images/file/66790235068.pdfIn PDF document text
    • https://w4gw.com/file/nowesi.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/41551925452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=segmented+worms+-+the+earthworm+worksheet+answers+keyPDF 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_off00022740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22740 10960 bytes
SHA-256: 01d0d21b71a018576bb7bd125eba46dee1c9c4314e78859559b053f948cad35c
font_01_sfnt_off00024064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24064 25448 bytes
SHA-256: a247c1be0d93d935aca7984a0c0429476a35427b33d30f806e64f763edfc9d4e
font_02_sfnt_off0002808d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2808D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1