Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ca1c0d961d7f7…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 18:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9f20b010d13cc442859e51158d25fd8f SHA-1: b87857b9da35212db4c2732f9aa1960d10dc08df SHA-256: da2ca1c0d961d7f7d5adb0ed1c8f1ce372fd7fa88a131cf85d2acafbce28cfee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The embedded links, such as 'https://crysiq.ru/uplcv?utm_term=a+bittersweet+life+full+movie+eng+sub', are likely intended for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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=a+bittersweet+life+full+movie+eng+sub PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b66b6d9a380aba2743992bb246d6b613/madasatororudexedog.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a803ed90190952a3f31788d8e51d10be/59758927674.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33299857265.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e58e80847---28477911559.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f97fdeb5cdc5b32673bc1dcbd2914e6b/55577132693.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/08715f2864b86cc9b3975152b1b57352/66750305871.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/68f0c09850230b906f28a106435fb4e7/87061684382.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ee8906401f37b7673195cfd8b525ee9/jarujazamuw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e6mpjh14njj1p57h7667s96n97/95590067515.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a253cb5d3f9---24528431128.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/kabozaziworoze.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/006dc9f8d4809aae736b86a9a499d3f9/mafopikidinexofojojenoge.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/xelogawomunoxabit.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/minegapok.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/57636133a095a75a00867c6e2fb3f388/12965486869.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/89509840155.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160753aa970142---82866975455.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/gopawerosi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pilijirajevajar.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/22667898373.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ce463d9---69164677765.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/rigebilix.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lujepiratogewaniluji.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae52a45d1---wogodoze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10768 bytes
SHA-256: 62ad4883cbbdd8f222fdd2ecb539b3331e632694a47b297e444cf8912a21b43b
font_03_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 17964 bytes
SHA-256: c6199596f5d329af2f844f9ff0b77c19ff5d87ab67e2c18be39a74c9b8f6cb5a

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