Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e5dc25e93dc7cb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 01:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 343740c434fa9c04c221a002019b4eba SHA-1: 853ffc025f8b85ff280a1b090d67ccee6f7c60cb SHA-256: d6e5dc25e93dc7cbb0e1260317549cd3925d4eb9388c5e2edb9952d433b972b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded JavaScript (T1059.007) and the overall nature of the links suggest it's delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=phantom+of+the+opera+overture+organ+sheet+music+pdf PDF link annotation
    • http://medizator.ru/ckfinder/userfiles/files/banolaxokilum.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/55483117379.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16109c5203aef7---kenukebudenuxawilowalesix.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37062cbb6526cc08b5d05edb4682a940/poserivorepi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/n29sc5bsf1lfcorvu7jvg2td74/62371754854.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49944504260.pdfIn PDF document text
    • http://valeneighbors.com/userimages/romogekijarepuvixenetamek.pdfIn PDF document text
    • http://wjcopy.com/upload/files/posulesikegasome.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/960a50b280a11808aae190744b3ccf27/83866383611.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xanurodumubizuzudozura.pdfIn PDF document text
    • http://rem-proekt.com/f/file/rabobujazutofigil.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/51420045003.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e99c31db---23803825312.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/2678621433.pdfIn PDF document text
    • https://birotex.rs/images/files/wijomibigonugugexibifugus.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/86585018293.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wepufipe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611e524554a14---80243819144.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/60352346841.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80313252e---nilimexonapolesifevuwasep.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764aa38f3d9---ketal.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0e7a16c717162afc1a06694ff7e5c299/33768005806.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f196e8c2c---biduzav.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/dm92uka1apvmk2qsfhjfbla79q/62993461368.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17992 bytes
SHA-256: c8847551bee04540fc8bb90a09ecc851972cf8270a19553df21197b6a02b19a8
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 11188 bytes
SHA-256: 4f6d887f7d00b669d705e3f53391493cbd8904d2963d636f9b31b112837ad54b
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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