Malicious PDF — malware analysis report

Static analysis result for SHA-256 3177c1a79214ef64…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 11:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09240997e1fac2cd9c0533b71030817d SHA-1: 3133acf92f875e392a9567f83a49efcd7e8e4ad8 SHA-256: 3177c1a79214ef6437f40147cb54fedf999fa4abd012dc329ddcf5b5ffd91c2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd58aee---linojagetopegolijesanu.pdf In PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/tojalozo.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8779b609cd85c871283c15ea0120808e/sadubaginopotiwovagoguj.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/172c1d3ce4b3d7e866ea8ed3f1fcddfb/pomil.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/24636619606.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160941d37ad10f---wuxezugobudixonagom.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/nodametenegodegore.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9a1acb93---69793831830.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/dunagu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/fegaditajopuma.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/lewojewosomexanajop.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/furen.pdfIn PDF document text
    • https://congchung7.vn/upload/file/63767650719.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8ac47c30---80343938705.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/60198432621.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/53114392599.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/20066954709.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0732b392f95bc7e784ed5ae581fb4279/46565981155.pdfIn PDF document text
    • https://ghnservizi.com/file/16147324084.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f2022e99---tiwamalawugemidetim.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/16333060415.pdfIn PDF document text
    • https://termofriz.rs//files/sawariwutuvawov.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/kesewuvurodasajowom.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970e7c3055d---58080133413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+craft+an+axe+in+minecraftPDF 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_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 10460 bytes
SHA-256: 134d200f4a63d907e5bf3d0234795a1c8fc7feb58d9cd1d683bfc1dfde966dee
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 17408 bytes
SHA-256: 18839eba305928f0863a9aae46daccb064c62c0fa7cfbdafe02ef019ad5a6994
font_02_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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