Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b2f773d31c8e2b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 23:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35f8b77546de56c21a593485f27750c2 SHA-1: ce0e906991eac43a0a78f44f2afa768c5c3c4c7b SHA-256: 59b2f773d31c8e2b4b76fb376c8cd34f71182048a358c56c321e530fa8ca6392
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 external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ctyrkolky-gamax.cz/data/dokumenty/39185139060.pdf In PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/73848478675.pdfIn PDF document text
    • http://gyobel.it/public/file/garubaf.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/wukodezazirezuziwam.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jitosatabela.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/dac187b731afb51fe1ef802acc4745f9/vudisovilinerigatamarinok.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9e0c7c1c---25714784700.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/zufukazi.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jigiwabotami.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/4145684725.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/78575d9f2684b00d1d36a8e923a28ed8/37402678847.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1nd9kelqlltmlp4fl0kukks2p4/xoninemi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7984c7b495ddc48fb1f712e2ad6d13e4/tibukisuwewej.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500d126a3d---86337428385.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/vivumisedam.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/fipijozosilewot.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/989c260c3665ae2a1ecbbcb3aaaeca74/vozodisetus.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f19c19e---47663626347.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/wanirapamedoze.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210629064619.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xobaxojakawul.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/36a9deeb8f96974832625490e7bf9139/43365447665.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/113b6cd32b3a42053f687eea8ffdc227/losegebajimafezogulebil.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5584e672e8---82380041085.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/73977450243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+delete+page+in+pdf+previewPDF 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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 16412 bytes
SHA-256: a070163dfd3369cc7b38494b1d3a84119631deda2e7fec72a0ebc8994c85f756
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 10648 bytes
SHA-256: c186ba1b2b845b179c2d9964b2b679a882869da5513d4cc950614753e6e9b2bf

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