Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4699c81f2cc5c02…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 16:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6f2109b0d250ddd8af06c465d811237 SHA-1: 038995ee7b2f1d5a85b8c500fa759f88eb5adbb2 SHA-256: a4699c81f2cc5c026a7f0fd0d16377d6e9e6320a222b8291d91842ecca3a9db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable web servers for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/av5uasnfh5clpbn28ga3hbc0rn/zerabolagovajumawij.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3728366845a82fb84331e9c61b930c2d/42979210236.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c66cb4f90---64580308277.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/tilizuzitevudotamefifux.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/depameku.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vilunuroz.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ba2804a131a7334376cea28a6d3ff864/xamosex.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/kosom.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/33518350697.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tapaxegamejamamusuzosol.pdfIn PDF document text
    • http://www.bash.cl/media/file/bileralaketi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/49090b552480a188a99b5e3ac1e36075/85300974008.pdfIn PDF document text
    • http://agama-rc.com/upload/files/jamirafejofovupepun.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/71180701003.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/savepipovawera.pdfIn PDF document text
    • http://artepcb.com/upload/files/ziredejado.pdfIn PDF document text
    • https://unosms.us/userfiles/file/97163546245.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/puzenapetuguxagi.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/62582049815.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/73475100323.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd545b62362---27087320602.pdfIn PDF document text
    • http://esistore.be/userfiles/file/33409696524.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/levesilebizitelaxosaf.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/newuwobilaguxepevozigijob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dependent+prepositions+exercises+b1+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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 17608 bytes
SHA-256: f1b59f5c64e73aec2b1b4f33755b500b4b13e04d6895253ca5ed94c04614a2cb
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10700 bytes
SHA-256: 36959a1356c15736a6396eca11fb86966d453fe22c0ac12ca055ea0c9a1f71b9
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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