Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51c967f3779d65b…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 20:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6f5860a08a2add54b9202bceb79174b5 SHA-1: 5051dee437e747e25708bc4a93ca284841f19c89 SHA-256: d51c967f3779d65b4a0c7023432b8a6bd743f92d37abe5b7a9ebaeac6f1d7ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://vetranhtuong.info/luutru/files/87847567042.pdf In PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/tegur.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wulikorovevisosutigada.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ltg4groe63qntqaur8akkqi7q/16057662215.pdfIn PDF document text
    • http://dr-temt.ru/images/file/bavopalipatekelevum.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/ruxiwi.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/54689379080.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/23156618712.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702da027706---verifofitukot.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c166ca0053---62723629064.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a52da9f2---45785916501.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ba1nilla76ljcbsehfi0uelp16/17374008023.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/99174771405.pdfIn PDF document text
    • http://centronegozi.com/public/petosolimipatusidepuw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4b1bcdf8---voparuduvapudojuwenojep.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c12cc348---mowazuteziwotoxopekoge.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c55a5bca1---78953804399.pdfIn PDF document text
    • https://ubranni.com/uploader/files/79180643243.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/32911833903.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7947c754---2730068178.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eae5af0cfebe12bffbe2b3f9ba2f869e/gonaji.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a529880---watomubejijurafelutolexi.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/lefowalikaxuguwamizere.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/306fdace2ad3b73b6b96188beaf9280e/sekudajelulazudexe.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/rerakikalu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0673377c49df87eedd97c4d7f019bfd7/sulon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=psychology+standardised+instructionsPDF link annotation
    • 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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10864 bytes
SHA-256: da716052579b75ae7d142aaa70df0e174865538430bfd164228e601bcdecd1fd
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16856 bytes
SHA-256: e097352007f1c15e3d8f1dbdcb7a21681dcb45131eaf0854eaef0d9c79a34665
font_02_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1