Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c05b10ef1b29bea…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 23:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 520b464e23d7fdcb5ddd1d673f0be912 SHA-1: 829819367d19867630a0dc46d94ddaeba8d30fbb SHA-256: 0c05b10ef1b29beab43f4f04f70999a0a1ba6eb4973efb470478718f83edcccf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=hyperlink+in+pdf+xchange+editor PDF link annotation
    • http://jiangsutravel.kr/userfiles/files/20210609_055218.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5e09acfa545b12352646967270765f94/bobowarinam.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/931b00d8e7c2da526c0b448e55476cd6/36739759879.pdfIn PDF document text
    • https://semut73.com/contents//files/33418338053.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/53302395716.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/50284515aec59f3d323e589484f394d7/kunazigolivurolekoteja.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0qlh2gn8nbnm1ug1fqnrpb1fu2/91830571620.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/217a8cb79d4ecc9c2ca848a83e77dc0a/jedupusuzakopewedobifum.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/zuboraxazoru.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7cpm27iitngffpou8npgr7ne2f/23382374668.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/rozawuzalino.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a34bef227b2---nitaganagopisiz.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xizukoziwuxojolodos.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/82034641723.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/i2mvd8275k23d5gspsl8jfilhl/xanevusonodo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a51fbc4f5ef5429a2f546ab23e5765a9/91762244706.pdfIn PDF document text
    • https://euchebnici.com/img/file/gigulilubepemiwoliv.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302d1e9d2a---pejijawejolanenesuguxir.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/17468483258.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/8206f899632d6f1b335da88cc471e68e/42191533528.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79340939ff---60638592041.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9d8e0f31---18565906516.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/liwemuzipogofagedixe.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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 18192 bytes
SHA-256: 4a531b515f6fcbe69e881c20bb7bc77153f9bd1e4ccb1aa92d1991d9788a6ce8
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 11032 bytes
SHA-256: 173c9c32631bfd957aade9fd97ca0e4a92e2303d7f3b3a634c4841b8b39ca2bf

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