Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04d1bd348bd9c87…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 17:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62e880c4b8429770adcaf65a581ccc9d SHA-1: b90b4aad30a3ece602cdb6ea6f8ffe571a277731 SHA-256: b04d1bd348bd9c87ec4f6669ba336b0f88be508d9e36a63141d0dcef3c202b3e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The presence of embedded JavaScript and numerous external links, including those hosted on compromised CMS platforms, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, indicating the PDF is likely a phishing or trojan delivery mechanism. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=tubemate+install+free PDF link annotation
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wanisebixamodiweluvijita.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b602f2f1---raxagepixilivotarewutojo.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tupokemaruta.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/rubemezalurowinibe.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/foromu.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/14747354052.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/44079077190.pdfIn PDF document text
    • https://dm288.rs/slicice/file/kexilo.pdfIn PDF document text
    • https://activepymes.com/pub/file/nadufofanumagadesalus.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210904235908.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/guviremosuditovuxufo.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/15601571187.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/35994689285.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed229c8d54---wamefawifekugu.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/sumizavuvi.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/40818596758.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/24563527028.pdfIn PDF document text
    • http://vpsystem.com/files/fck/78020357415.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/88690344967.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dcf65ca985a5f08ba6ce2938694a101a/62834480125.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/91489059429.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/4044050338.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/damodivuparedusi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pinobipodepewa.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 17544 bytes
SHA-256: 64b25ab9e6c3b51dfafd41c8226da491b51d492a83cfa7dd6ed26e6856f5230e
font_01_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10456 bytes
SHA-256: 028b9f1103349d4e91a9b92ca2387f87faa96f79b31061876bb6dd436022a44b
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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