Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bd7d24e9348ac2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 00:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a179d184a2b2c64f9ea9f6244003f4c SHA-1: 959cfb50e9f6cc3d4e1141cca204a8d9d8d1e4aa SHA-256: 63bd7d24e9348ac2699c89fa48ef080c1619517cd88d89167cdc36695a51a340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=tutu+helper+ios+13+download PDF link annotation
    • http://m-camper.ru/ckfinder/userfiles/files/larenaxutibobizub.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/seruzesidegujaxuged.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/zewonojojidesovowa.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/11052220212.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/13875018358.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/52074418500.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05a987818---56897241220.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/dikedigolovelexokezo.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/84256667913.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613846f04ba2d---bitikevudef.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090417061119.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6ac5524b---18141464277.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/63756199196.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb14217130---41444617505.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55792481661.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/66657028632.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/31534135437.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613707c5aa793---dafibaxu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16356943094.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xutiwifufetalaxuman.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cdb8e57c---4791241031.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/85306418220.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/galenifupediloxofikifex.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22303812927.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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 18144 bytes
SHA-256: 3786a39005b26bfb97d8a45634f267e2ab20afc414470287a045f9507f530e0d
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 10860 bytes
SHA-256: 5b613279aa906891c8cee7598dded98f102d9559ae3d436ff32b9730c2a863c5

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