Malicious PDF — malware analysis report

Static analysis result for SHA-256 535636499ea42316…

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 09:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93f70c0ae270108d8088cfdc35b190aa SHA-1: 6d816bdc1266b031e41aecef55fac16e698b9b98 SHA-256: 535636499ea42316563778410bfa5c1da56a18c9643add76020a7017ba5ef3a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload directories, suggesting a redirection or download mechanism. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812a5f9ad02---45857074131.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5781b08db---kojiwazefe.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/b6e6fb973da5734379c26d4d345c95ef/vosugexip.pdf
    • http://atthaya.com/file_media/file_image/file/27468023439.pdf
    • http://51www.org/uploadfile/file/3aff710401ff35d941c3ac51d1c18173.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16089699cf3fbf---1936162088.pdf
    • http://arniestribu.com/campannas/file/44937381534.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/87876c2d6d19b2d28c530b51ddd121cf/45276860381.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074215fa2e85---81927522554.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608145fdf3c8e---41158877279.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aca754d1035---75966496535.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b199fd67dcc77e618a732a158d5eec31/fibedosevuxu.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c236ed07547---bedazewuzu.pdf
    • http://dashoernerboot.de/userfiles/sadoxilafosef.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607219a92fe27---nanoziputufuduvupogefot.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0490383f72---supakatosavedipasivopap.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/pikoguwotularumi.pdf
    • http://nsfeed.com/_UploadFile/Images/file/duxivodojavavino.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/26a10c3fc6eaca259529d515a7d885f4/96970035128.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a128f8caa88---61828767096.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe3d99f47---legugewawowumor.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607070438efbb---11622380654.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5e9a7e923c910bd2b921a1e7fabbcc3a/22022669772.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=maintaining+privacy+and+confidentiality
    • 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_off0001026c.bin
4989bf8060026a4972bb3605bfd71f0c776cfe03b344ffc269647670a8eac91c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 19492 bytes
font_01_sfnt_off0001356e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1356E 16792 bytes
font_02_sfnt_off00014d85.bin
10fee03ea65a40ae8e50de8648a325c2bbe7a12c2dd24c025fa505489877faaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D85 10800 bytes

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