Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5659f0eb7af7cb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dcc99de2bbe3db4432ccb8afecd60bb SHA-1: 6ec8b43e9b6a628d4384ab4677b24cebf7f97e84 SHA-256: 5b5659f0eb7af7cb621bf10627bd62182a03fb52c67af1f4b3efbcacdf1cf36f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to suspicious PDF files on various domains, reinforces the phishing and malware distribution intent.

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://le-bouquet.be/userfiles/files/tufiluzovadelamip.pdf
    • https://everestart.com/images/stories/file/woridaxox.pdf
    • https://cordovajewelry.com/images/file/22618767066.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83722999414.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sowifidip.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/muwedexo.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/66966647146.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4qujbo3gsidc8l79odia5r3a35/pevelupikupobuke.pdf
    • http://nifaelectronics.com/userfiles/file/vogujagidiganilepovizej.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210906154804.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/31801544047.pdf
    • http://www.radanhorse.com/resource/files/pemas.pdf
    • http://redactron.com/userfiles/file/69347513498.pdf
    • http://wellfoto.cz/pictures/files/rafate.pdf
    • http://alemotta.com/resources/original/file/85576499753.pdf
    • https://dm288.com/slicice/file/76442404285.pdf
    • https://bela.geekers.tw/upload/file_folder/file/wukoxe.pdf
    • http://planetamama.ru/files/file/95753655653.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96133af3---tenixi.pdf
    • https://speculatio.in/ci/userfiles/files/fekumur.pdf
    • https://asiantms.com/ckfinder/userfiles/files/69387603991.pdf
    • http://moscowballet.ru/userfiles/file/mibagiwujaluguwujimupa.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/zijutoxugosa.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7a0e750e---72274918977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ispoofer+pokemon+go+android
    • 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_off0000c179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 16792 bytes
font_01_sfnt_off0000d990.bin
521bdb9db37e1f3f890baa5e999492b96ff8ef8ce7fc0739e2b02d0e43608e3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10740 bytes
font_02_sfnt_off0000f203.bin
08f65463967fa6d3f6d7b0a15a0a05d886076a031ed4abcb2ff48ef8c6585333
pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 17872 bytes