Malicious PDF — malware analysis report

Static analysis result for SHA-256 205e5510e3a21401…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 04:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93fa8b958c21e97af6a30e6400094ddc SHA-1: 4a8e637b31baba9bb64c744c6a2068d76da98ce4 SHA-256: 205e5510e3a214011f0d252cfe6992cecc4dac0970214daf42dd4deb16478c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests these links are used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=unlock+redmi+note+9s PDF link annotation
    • http://teakdeck.pl/files/file/77157776845.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/vetosu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nibirorigosomizadadagilev.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/konuru.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/60667266438.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/ruboriwatasevuzojox.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/27851074091.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58e62c35958514310a83cbd1760a2753/kevitopukofojuxen.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/29418818322.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/17665963877.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbf377244---binagiju.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9dfdec94---40521440595.pdfIn PDF document text
    • http://furniture83.com/upload/files/buzapitudonafo.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xonomegidogapasegotekago.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136260d1559c---82786854087.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/kirufevivakupapeta.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wafunitova.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/93413146153.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4d854fb8---90137128867.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/55673245640.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudexedudiweli.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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10636 bytes
SHA-256: c67fc2473e65d7bd7064b0a2e955ed16ba54e0664b874e91c040e75f200e93d6
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 18144 bytes
SHA-256: 0ad753dc170bad780994261d19a66bbccc4a8b27c7c6cc63041dbe8b046761dd