Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a34c63507def00a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 14:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 175f929486ae9b1115a0c7c424b506cd SHA-1: 8c6f43f0efc60c68f949864cdb0f4e1b49662b6f SHA-256: 3a34c63507def00a1e83bf5757e28cc8514c1aab37c63a44dd631dd53a8090ff
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=rudolf+carnap+pdf
    • http://riversedgefm.com/files/file/18822851233.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6e8cdc7b---97629884274.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fdoh19f0jq96mp1jv814ns1iv2/jibotozoxomi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/l3q3o0575k9mh876rc0nb0vdvl/wutewidiw.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/89648055019.pdf
    • http://lubrifianti-auto.ro/files/file/mewulovox.pdf
    • https://bakwanudang.com/contents/files/vipovuratixitezew.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/kevorezaxovezitovo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83176b57a---farowavomuwiresa.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d150289c42---60242694320.pdf
    • https://semagro-msw.ru/pics/images/file/faniwimilagenomoka.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a52a6bda8---54541517475.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9f2bc41cbbee6a582b405bc5faa26aa6/49944687867.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111cca6e4cda---16022485953.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uf1rnpnio4iamgb5oajkreifo2/dunevogotojodepasedaxidor.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0db4949d---kozusovevemukuza.pdf
    • http://regcureguide.com/files/files/54893252053.pdf
    • http://inistor.com/ufiles/files/41096331562.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4577c23994---82066707126.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/44522256351.pdf
    • https://forexinc.ca/upload/editor/file/wubifenalifud.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1b458aac---81592745497.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0159465eef24d70aeb858b69f74da273/30824250596.pdf
    • https://juhaszautovill.hu/userfiles/file/nusifiborezetani.pdf
    • https://acgroupenterprise.com/userfiles/file/wurovabejivotebujafeboxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea51.bin
c6c794f5da1086eea3de8b106e90c53fe961c0e289811c8e8a3e0f6988f58efd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 18796 bytes
font_01_sfnt_off00011a40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
font_02_sfnt_off00013257.bin
bb1257f32441befa9e8055a963ed216bbb4e5df9631e01261ae3845361725e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 10268 bytes