Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da7463096fc9cbd…

MALICIOUS

PDF

96.5 KB Created: 2021-09-15 12:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dab628f03bf96e992ea68bfa4e789432 SHA-1: 901653305a2212513316dbf8e1c983ec47ac0784 SHA-256: 7da7463096fc9cbd6ee04aad25006779afef2384ce74bd9e4a4ef54973c7a393
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=o+que+%C3%A9+android+system+webview PDF link annotation
    • http://chekeeh.ir/basefile/chekeehir/files/41797375348.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/28932399683.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/1165614748.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/82576041234.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133656fc5778---witomerobeviguwawujero.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/24104422275.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/76337524660.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/12765377938.pdfPDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28278492361.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0d0c52de---towajodadonetolir.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/zuzifajef.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/sidobiradon.pdfIn PDF document text
    • https://panoramabyty.cz/content/70392160345.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/bebajaxam.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/2430095011.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///25864156190.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/sudiji.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588beea784---30505010130.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/28747568622.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/45468872947.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zisuzigiziwisapuj.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fj3timoofk2jm0gs107jl8gqgr/89673666291.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51632671884.pdfIn PDF document text
    • http://irths.com/upload_files/files/zepozozupuwa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 23948 bytes
SHA-256: 97fdd00c48b78a984b5d44827d759eea0a8fc45630db7752a2830e4dbd1389eb
font_03_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 11196 bytes
SHA-256: 1b534b92e82b444a72d110baf2d97257f778a73bb8c4e9aa3120774a7269fe45
font_04_sfnt_off00015aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEE 16324 bytes
SHA-256: b7459b1503ed40875f1400deb8ae3053b8c772db540b993d9ad8e46abcf9f55a

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