Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3039ebed88e2bd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 08:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36befafb8574b3f79f1861259da32d22 SHA-1: 17bb807f47466d89161d76cfb54f77077e5116ff SHA-256: ec3039ebed88e2bdb8b3d0a057454ce796efeef71906cfdacac527fbddfdb8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites, likely intended for phishing or malware distribution. The heuristic firings suggest the PDF is structured as a link farm on disposable hosting, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=s912+custom+rom PDF link annotation
    • http://pokewaveanaheim.com/uploads/files/rugifixuweniwuja.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuwiramoroneseb.pdfIn PDF document text
    • http://temple.mo/userfiles/file/fezejujukeliwi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/75493841389.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///61745450818.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/34353750466.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161350bf50431d---51486465395.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce17d2169---kawik.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/36978531498.pdfIn PDF document text
    • http://ave-france.com/pics/files/gadolaxatu.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109082321463600.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/20958685864.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/85096207160.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uvh44lqril4j3tb0nedccrgjdp/rekopovafabirunurug.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/72531635042.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dakanatekebozujewu.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210915_F42974BB25274A64.pdfIn PDF document text
    • http://etre-belle.su/images/file/79151509572.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kiloxurerenusetorugoben.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/79999143876.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/78206063135.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 18440 bytes
SHA-256: eef5c4a8a34421b87c9a87a390e7082106ccd801ee95b7ec8ef3c7ffd8b9cf4f
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 10368 bytes
SHA-256: 47a08b19edf6add0494faf412ca0e8ec22f126801e1d830bdcab60241e156773
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1