Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7602e9f3320f18…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 23:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74873af65e19d1de5df9424b5e9279b0 SHA-1: 7b1c2ae18be3c4b5911683b3ee737e23bb80c3c6 SHA-256: ca7602e9f3320f18c92237e96b4fbf9a703c2cf434c19c17e378e239a29a4fa1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these links indicates a likely intent to facilitate further compromise or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=put+my+phone+on+safe+mode PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134688f658bd---32958313421.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fu5seen12bakch88cb7rjis438/dozog.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0558068a2ba04cb109990d36c6c946a8/88510344961.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45a6d3cb9---kusubunujedotemipagarin.pdfIn PDF document text
    • https://defi128.com/userfiles/files/wotiz.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/20169371313.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/mufojafa.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/gojukezojegux.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/24807478916.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/21798507414.pdfIn PDF document text
    • http://orem.mn/uploads/files/6630021333.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/zapabawomutifi.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/magejuzeneran.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/vipofikezaf.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138358c0be04---bifezebafusafonip.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/23434692195.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/56452006066.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/muzefu.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/67646433337.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/6344452590.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vajavojerisenetovuvutu.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jajoxanolagufimuwurenewum.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/saligisenutuzirigedekimi.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/72850333463.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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17308 bytes
SHA-256: 2f12e1576d02e3ee7665e75dabb4c01dd61da1de32e751be1e4e6e57d5e40ff3
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10740 bytes
SHA-256: 238b9138af4594458eefb5c4a60d046245048857cb0f8c20b83e2cd6abafb05d

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