Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c150b0b768cba1c…

MALICIOUS

PDF

72.4 KB Created: 2021-08-18 21:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd62f15f87731da7f8e84f8f85c455c8 SHA-1: db3fe3a4b75e6be691344a2f2781e126c4d53d42 SHA-256: 4c150b0b768cba1c62ed45a54493b0dfb5978790db435296b77780d79739aac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. These links likely serve to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50e923cd4---lixunevevaboluzav.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/10882870938.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b685aea4c49---gagilaze.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/zosema.pdfIn PDF document text
    • http://suara.ru/img/file/5819192682.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/aaee30a11bd6613e44b8706ce9ab4a2b/76830217643.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbae611ef2---dutekemowozizasuwenedo.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/danovutebulonatisige.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/rasoxalokomagipitivujet.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609821e7b74a0---11440027069.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/28002901297.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbedaa2079---bosezutojirugojekiwi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a7b3ddd5---fiwolokepezefijoxojikad.pdfIn PDF document text
    • http://candientushinko.com/images/file/88093857255.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/bijirudusubawo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/totovuwejore.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/3583622391.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6f967f908---51245017907.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d30e5a932---nozivodibokojorigi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5dffadde044da160ce5d13eaa0157bd9/82617361821.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7341ca34---jisasanu.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/nafufitikola.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da57fb31f3e---50763120880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gumtree+ni+freebies+near+portglenonePDF 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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 15892 bytes
SHA-256: 2319ecd36aef2907c6f8920c5c7f176de17dca90e680d5516c8e42eb09f3e010
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10980 bytes
SHA-256: 2798b00dc906fe4cbec70890daaac49160ec1777f43df5c810b4cb76ed6acb09
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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