Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6b3c425d0535b8…

MALICIOUS

PDF

93.3 KB Created: 2021-08-19 11:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11f980ce6934514285e94554df866c4f SHA-1: 09930365f155d8980a4660265d5416db8376a7ee SHA-256: 3c6b3c425d0535b89dbb063ab87abd86702f864980617ec44baefd4de09f36f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://crysiq.ru/uplcv?utm_term=7+times+table+worksheet+year+4
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/barup.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/74000b06926f2ef6be8637fca32f4dc0/jivif.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f2993c0d8979b9866d5654438410a808/zobewuxefajizob.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bf087813a09---kinalodezesagopidikuf.pdf
    • http://ithaca1962.com/clients/41687/File/rapuranivovazifuroz.pdf
    • http://nceed.kr/pds/userfiles/files/jigisunujofelok.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449ba8d6e---didilode.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4343772b48---57497187930.pdf
    • https://stiff.pl/ckfinder/userfiles/files/nodomuxemikenixufuwatewe.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89123155024.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e7c8f42329faafefc33133ad2adb4c0a/15808228985.pdf
    • http://homearcky.nl/userfiles/file/21245848355.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/78936fd8e45c9d4705fcc6af33fa8751/16276293749.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/373e9f2e6d3b12ae0330624a4de7b00c/92283785974.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6417180c9---tusoweletej.pdf
    • http://greenmodels.ru/uploads/files/mepoxibalexipisigotuliwe.pdf
    • http://cityclick.it/userfiles/files/54470726002.pdf
    • https://goacetours.com/ckfinder/userfiles/files/zidelatikopawonajanosi.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/vanix.pdf
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/sorilukubovesan.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbbebcfdb1---54817647876.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b220bbdda40a0167746fc069418dbc53/78426424850.pdf
    • http://servmed.net/userfiles/file/bisedewapujelaja.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/jigetabima.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tokiboni.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/acb130239ebd6f72f21669775747b130/14110872207.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_off00010717.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
font_01_sfnt_off00011f2e.bin
45510434af30ddb7c819843a3d801b0fc096e623ce8d2b575d859b658fe3f1f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 10732 bytes
font_02_sfnt_off00013801.bin
0b0722b0284b5fe4d61d4cff028cc590819e092191b5dcfe0d09ec1889c80906
pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 18224 bytes