Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcbeba497d80857…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 00:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9c993684d11040f394c0792be22d190 SHA-1: bb085693e7297c05823ed0d9af23c2c3a3f7e606 SHA-256: 1bcbeba497d8085716e39334351160823240c5a7bee1eb69a3c42cd36b0ac333
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure suggest an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pmeds.us/userfiles/file/12973673554.pdf In PDF document text
    • https://mabuksusu.com/contents//files/larajefu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/02/file/20210802_082309_107.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4b892a921511413833c78f85a7dded2d/mitezenonowesonuxagujetab.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xasebezaxupularoxusebu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/eb37db2290ec0936e1a766fee2fd9c6b/netosog.pdfIn PDF document text
    • http://gibisch.org/files/files/61826250211.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/81511652559.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/revasumen.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/39136308529.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5308c98e---wosevofafuderil.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dc0dc82c---32300297141.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20705822759.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lerenitezadozu.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/93049982411.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wutimobosutelolizewineji.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/48759725193.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/66827611886.pdfIn PDF document text
    • http://gptools.net/userfiles/file/vuteduwazuf.pdfIn PDF document text
    • https://forssh.com/userfiles/file/femapo.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/xidivulaluvabilegu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1cmda04g69aldlaqm18clsine/witux.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/siwakolevafoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cursive+writing+worksheets+letters+pdfPDF link annotation
    • 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17872 bytes
SHA-256: c8a3ef90638f4e3a651ed58aa4059f37fe71984f8bd522784d761d33119e3b9d
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 10992 bytes
SHA-256: f4ad788deb7a76185bf4ac22af0a280e60a09025b8061ece804fa212c6b38b3e
font_02_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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