Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5946a93c1bf2ca…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 12:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c60dfd46c5497c4ca025df5983272a8 SHA-1: 97785ff2813b758a402a52b676261df7b2b8e4b9 SHA-256: cc5946a93c1bf2ca3565d2dea073424ad7e49ffc8d08b2d927dbe6d2334e653c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://laborke.ru/uplcv?utm_term=how+to+get+animal+crossing+new+horizons+on+android PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a194d183e---82964133650.pdfIn PDF document text
    • http://koala-al.com/d/files/tatavuvibis.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zalixovorefejumonatevedi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/raziridagumen.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210913_79D474B7D13C94D2.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/fowuduwosisotajonim.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28763875327.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/nizosu.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/86648160181.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/tepipekefibolaxukibubow.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/gurekemajuxon.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2a30b2d58---bezilujat.pdfIn PDF document text
    • http://adice-area.com/pictures/files/mojiponewuzibinukizesibek.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614e415b71159---15581501866.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famoburig.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11597dd9c---11226857988.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/43337206822.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210922_141353.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/89435838775.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/palawexugebelebisozo.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/vamakaw.pdfIn PDF document text
    • http://thongthien.vn/upload/files/64214398976.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/gavulezofizegafoxudofivu.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/remibixegofisezok.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/10418104425.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/xajevexetimowudajewif.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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 16748 bytes
SHA-256: c9889544644780dd28ae6e2becc0cf70b9a9e4d1a8e6b29ed5133215c7a0e925
font_01_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 10952 bytes
SHA-256: a78d1e71427f59211a0d0aecac8f4cbc379af64220a78f1e63c9ece09e711f7a

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