Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba53659f5143783…

MALICIOUS

PDF

90.3 KB Created: 2021-09-26 04:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6015ee7adbea5abc7d406a664110c6b SHA-1: a86abfbdb6dd4578a4301647032956ec9c245592 SHA-256: 8ba53659f5143783cd3b3548384b6592334885250fb54357c61dbbed38a58485
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or domains that appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://maintogelonline.info/contents/files/51261055727.pdf In PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/36036273843.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/989875e7e7df0106a5119e1c44f329e3/47014656372.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/puzabugutiwebokilo.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/85789028058.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/piragiwitekejonagisoxaxox.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907232750177607.pdfIn PDF document text
    • https://anfauglir.com/images/file/24177326979.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/81244514315.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/5061430758.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/zixuxopujofiwuxomit.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/weborajisijejudejadagino.pdfIn PDF document text
    • http://zgic.ru/!upload/files/33913398280.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4b7658c4f---26511773377.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/zedaxagujisasota.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/bidunekosu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210914052012.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/jobewazumugunazoz.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/78998485852.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902180154_1411573424.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97988308908.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/fafozaxusuxigadagev.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a84346ddaa25f7f84b86555db1777311/53978264882.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/19339097110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=e+tab+4+android+g%C3%BCncellemePDF 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10940 bytes
SHA-256: 4ecc331d2d2367ad29dbe383832c043519c709707a94e6ac8d56218fdbe2be4d
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 19524 bytes
SHA-256: 11dfb1d413b167d0ab539fe0d6a4d9c8fcca8a7bcc318cf7f4173f9287f13d75
font_02_sfnt_off00014154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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