Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ee7c997d71cbcd…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 16:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbb69daf4f99f062b53bf137d49665d7 SHA-1: 8a33879ce1b07ccb462ef0d07d243d4797ca12c3 SHA-256: 83ee7c997d71cbcdc691156b4690bed8e55076cbe6c3f7700713ffe6d14c2c8a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to lead users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=the+enchanted+charms+pdf+download PDF link annotation
    • http://debten.net/UserFiles/File/wasepodadewizovujosuzej.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1110470006.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvr62s2lt8cv3ia4fd6h8p2h67/kilemixidu.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/lebonap.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/14790613058.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/27833101939.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109120714134817.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/bojirewuzenizubu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/tojadaxalimasisixa.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/11522846113.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xedogeluf.pdfIn PDF document text
    • https://kokomanis.com/contents/files/74465546639.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/47567603110.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/37013735917.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd00ac4f5e25434fa7ec6df07465e59d/xanejowe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a9efc38fc4c5c77091e36d45f176b108/51219160687.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fofet.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/nalexarowejutabevojilunuf.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/78182282461.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/26181860938.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/37566637853.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/13807849178.pdfIn PDF document text
    • http://santabruna.cl/upload/file/nizawiwulowinumu.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/kewasafebexifi.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/10637826401.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/30276484874.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_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10844 bytes
SHA-256: 512548f1033ea39655deb65f5650faf8de4991e06ad291173d46cd6338403273
font_02_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 17132 bytes
SHA-256: d6b0eb060abf62bdf06342015e1c13860937e9fb58949dd548a75c5c43eea728

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