Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b004583f4c209f0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 23:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a0bbc917755016c1d517858e97b3c36 SHA-1: a94db263cd5590b9bfdeb50fc37df6d0f002444b SHA-256: 5b004583f4c209f0396b7c1a2bf6d0985bc08d8e75d216f7d530a8f7eda06c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The primary attack pattern observed is the use of malicious links to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=revision+worksheets+for+kg2 PDF link annotation
    • https://paroles-vives.com/ckfinder/userfiles/files/54261828397.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0a66217d2779cca32bd38f0be820a184/fanudosizawejezajanobo.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/77630927116.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c99a6f3---gudupibedo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6d697e9c1d2c83f01e0175c0d6b4b446/8188351614.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160df01be127fb---winuz.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/xupanutugunitebifudat.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/62839549532.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a508f0bce91---68740510833.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021541648127224.pdfIn PDF document text
    • https://fallsplat.se/file/sulonapodugo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/46414947801.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ee746f3---8600650280.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/dakudovaxipujip.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/37227521570.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/88496785466.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/47050972592.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5361b918---77993552839.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/72344575506.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed913cf5e1---68994489824.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b5d10a858---94805869537.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/887f7aab4eab424d456946bbb595237c/97055154301.pdfIn PDF document text
    • 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 18752 bytes
SHA-256: 843881cc56b1ce06479312ecbee2b72f7f1cf45fc654e6ecf60f99fb096bf25f
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10692 bytes
SHA-256: 207f1d62ee480bb395bcff604d63615823d3c22a7146f17ed8a7a68aaaeea9e0

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