Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23aeabd651dde6b…

MALICIOUS

PDF

96.6 KB Created: 2021-08-01 03:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a19aa3edec4deb39ac33a70c55b58c44 SHA-1: 07c1cc16b474197c59e3974154738d8cba8dbdee SHA-256: c23aeabd651dde6b67046f2f57fba8ae13fd8bf26d6d9556775788d77b74b9d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised CMS upload directories, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=exercices+sur+les+pronoms+personnels+cod+coi PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/wakewanawazegukemegakigej.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ee6e55719---tajuzilelino.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2fe349c2---videjuzijenedipovowogop.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wonupijururifozoperag.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8aa004606---57842848843.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f9741776bb49fe172c59c5133f7f392f/zizozabu.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/1022621245.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/77893847681.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5642655be38cf21b75b8b4be718d393f/tajodezerogokakedine.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/fakomopinepani.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v7qp3hrqp5cqlogl96ccnuhua5/xerasumipisef.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cfc450fb6---gevogekoderoledufos.pdfIn PDF document text
    • http://unsersohn.ch/images/file/73254075591.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f37f5582b5---guwijabavo.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/52441103778.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/sukejemedet.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mewidi.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/73733516043.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/57562155874.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/434103e29ea49fbad789c6d9989c56d5/77106388464.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/wewizutemutaju.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/rodadedov.pdfIn PDF document text
    • http://www.lefleenunclic.comIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 20448 bytes
SHA-256: b1fc2b7aaf93da7d2d3711485b516f7c4f63e9ced612cb58f84460a9bf22b4b5
font_02_sfnt_off0001435e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 10600 bytes
SHA-256: 2183b2756da4b07aa179810b61d0b14da45a99e31b309d119ddcc71c7fa85c99
font_03_sfnt_off00015b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B80 16280 bytes
SHA-256: be851b298df7c3c9d2daf20623ae38acb6a52fc53d8fe81893fa0ee80d61d9f2

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