Malicious PDF — malware analysis report

Static analysis result for SHA-256 6540be0e7b128ac3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 17:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 105163e832f4aaee1e01b340886368b9 SHA-1: cc6fed03e46e91da444499aa91fe6c6e5f71d997 SHA-256: 6540be0e7b128ac37d1f9285651466cb139a40b0714a33cd049f6e46fdb3c7ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://huntic.ru/uplcv?utm_term=commit+to+memory PDF link annotation
    • http://candientushinko.com/images/file/linozibufalo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/dupafutibuvipobuxa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/19321501893.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/44007931884.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/365926546.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/33609630292.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/a33csra65u9kihvanmaongbfo3/tokamogavujuzu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210608_235646E194D452A6.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/vewizesulafibeb.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a934b9263c2---xafumonurevodigurisorefel.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fugoxowajinibipip.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/30264e0d73c4ccbd0ccf053020fd4587/bixojutejeli.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/kifalaxaguritemilo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61932265406.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/wusanuxudugipuxad.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/92707169691.pdfIn PDF document text
    • http://progetec.org/userfiles/files/90749725267.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/21b775e42454558b9c269f2ec565316a/guperelazonan.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/78539776379.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/4757632876.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3ea7fef4d6d9db3ef8a4e199c9a094c8/31080132810.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/14715006745.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/ruvilutefofefubejaxedogaj.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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16980 bytes
SHA-256: bb82dfe02686dd9bf8820ed07ff5b6343dba6c506fec000f7d45010faa9f208f
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 9936 bytes
SHA-256: 28bfcf1856940f56709fc6ffb04ecf9bba08f9c3e448ca64538721f39c84cf81
font_02_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1