Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b60fbe26215271…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 03:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7afbde3eeb59ed6da2841a3db6235b28 SHA-1: 49b0ac1706c4de0c795f4dd14cf0ec883eacf8f3 SHA-256: 15b60fbe262152715d8135c9c8e9ab1e741a4b4a2aa637c771f41dee88d9b39c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to facilitate the download of further malicious content. The embedded URLs, such as the one pointing to a compromised WordPress upload, are key indicators of this distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://etenindex.nl/images/uploads/piligen.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/82737221288.pdf
    • http://boldogelet.hu/media/53591337723.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/436f756611878ee540baa554e5c8d70c/53110602960.pdf
    • http://jj-metals.com/userfiles/file/2021090210480373499.pdf
    • http://mweb.cz/images/file/vemogu.pdf
    • http://goraku-sangyo.com/userfiles/file/87602123268.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613284c8d567d---puxawibopinisatu.pdf
    • https://wangwangcamp.com/uploads/files/202109011905596249.pdf
    • http://www.cottagegrad.ru/files/file/nobenitujujitezu.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0755ae4b4ed58bd93b894e1357fcb26e/dolesunanutan.pdf
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907025821991296.pdf
    • http://njchemland.com/upload/files/26804120792.pdf
    • http://erimti.com/userfiles/file/60284767782.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/38310650504.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3f3cd1677a7644e023a7ae5cd61e5e7a/82596702110.pdf
    • http://www.astmalek.cz/obrazky/file/dinidig.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/4729497066.pdf
    • https://bravo-hk.com/userfiles/file/17173488034.pdf
    • https://hr-serdahel.hu/images/file/49327206345.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161392b55c40e2---xorovovojimi.pdf
    • http://mobilenmr.com/files/files/sajixiremekelug.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/wojakatibot.pdf
    • https://tranhdaquyhn.com/uploads/news_file/70930446071.pdf
    • https://xn--psg-9lac.hu/files/files/11135443843.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+wifi+wps+unlocker+pro
    • 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_off0000d704.bin
2db49529cd8bb74e064e3270b2ddf1e24ac6c580e7e66b6761d00c59e904b041
pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10796 bytes
font_01_sfnt_off0000f004.bin
bf61465805c77e204a65fe0f24ef4b77cd805bd9252eaf76c9baab66bf9394be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 18684 bytes
font_02_sfnt_off0001219a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 16792 bytes