Malicious PDF — malware analysis report

Static analysis result for SHA-256 50013ba7fa7b7690…

MALICIOUS

PDF

104.1 KB Created: 2021-10-11 04:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54e1c4a3280d5da6091aa1f6d8510215 SHA-1: c05e655a3ea09dfe669f073ee5dc92ce6150a6a5 SHA-256: 50013ba7fa7b7690c7dadc9b2cba76547c4b1a8e2d82af71b7a38d9642ea17bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_LOLBIN_RUN_COMMAND' heuristic indicates the presence of command-line execution tokens within the document text, which could be used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145249822926---jolonutewajanepolodivilod.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95b377a73c6ee5e5bd2ab16b042fc55f/tizewaditujarana.pdf
    • http://studioesflores.pl/obrazy/file/ledele.pdf
    • https://yourwebcenter.com/files/file/28718633965.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/viwexemefenirodanep.pdf
    • https://calienglish.com/ckfinder/images_store/files/4677387828.pdf
    • http://bigdoughpizza.com/uploads/files/77684374844.pdf
    • https://familienbilstrup.dk/userfiles/file/gopakuwalubuveseduwebe.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/44204710812.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a2932378---tupidigefumetolilu.pdf
    • https://vibangnhadat.com/uploads/files/35390109209.pdf
    • https://menokatea.com/ckfinder/userfiles/files/podasedigabebiviji.pdf
    • http://riskhedgetech.com/uploaded/file/27394689161513ffe9fe4a.pdf
    • http://charmingcurls.se/upload/file/3406810650.pdf
    • http://edituj.cz/res/file/95712106592.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136649f74507---96755573424.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/99953139489.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/bedufigotuzig.pdf
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38065086598.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/77822020227.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4daa4470b4571aace5ae28255ace5e0e/zovenetifuni.pdf
    • http://sushibelovo.ru/files/fipil.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/zorabawaruzorib.pdf
    • http://szyuangang.com/UserFiles/file///11772386962.pdf
    • http://symbolfoods.com/files/file///towuwipe.pdf
    • http://edituj.cz/res/fil
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=quran+embryology+wrong
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
font_01_sfnt_off00014260.bin
0eedbd21ac423eb4619e1e3c35601c723de1cb3dc73f7f03ece01635296de10e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 10592 bytes
font_02_sfnt_off00015aa3.bin
91b259687936d0505a9647410ffc6331d97ece382920ba153fb2096655050b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA3 21920 bytes