Malicious PDF — malware analysis report

Static analysis result for SHA-256 c411cf58988470ca…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 14:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e94d8c1cd460fe065c64027dcb8edecf SHA-1: cd80ff4f982e566c21a422ded9c068c7d0f841b2 SHA-256: c411cf58988470ca3ee89952a293c57d120b7de2eda10a6dfce9f3b45b795396
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload directory, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=best+pokemon+hack+games PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/36bfb7f8f9fdc3c2e07b948e0f94e1cd/58217399767.pdfIn PDF document text
    • http://sbairs.com/datas/files/3945434137.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/34289656056.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/mogosogafepejumupukuxazon.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b4da532---papuvitifilufigolif.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/bogipipoxevadumilin.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/91979873108.pdfIn PDF document text
    • https://maria-galland.ru/files/file/48585540050.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3a4d62c0---baxiladasoxomosex.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6dac496e0---29903254903.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/71246086106.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbjsk8f32ii4cif1ng0hei6rg4/vofam.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/popebiduzanuzikoredaxul.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/xegixori.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/xenewa.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/32205216673.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/galazinasisiwinujemuf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4842d6854---19935348287.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/gimopuri.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161308cf15e17b---xanena.pdfIn PDF document text
    • https://huanghecables.com/d/files/95838176245.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/17008312169.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 17816 bytes
SHA-256: b7dacc13d26ebd0bc1802617aa4e5a101eec8adc2a3cf194381622d9ba2cb7e7
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10728 bytes
SHA-256: 108e97b315565f10cc1650f4a0914b5830464f1597dd31e7cdb3e428b494e93c
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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