Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13609423c7abc10…

MALICIOUS

PDF

97.3 KB Created: 2021-07-31 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f8d97cb7191b715e490dd2843143c0a SHA-1: 7c2e256ee26f511f82775d85655c4d6b93df4eff SHA-256: e13609423c7abc10b0429721eaf23ba8bf2e6a129f8b2dc8a7fe28297073fcf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This 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 compromised WordPress upload directories and other potentially malicious URLs. The embedded URLs suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://archism.ru/uplcv?utm_term=data+quality+dashboard+excel+template PDF link annotation
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e1e0f46a533186954d560ee41ff687cb/41989759059.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/80240596155.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/81094643665.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210717_010221.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/likalewojuzulozedogev.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b77eb5ac2b420a5f70eaf39baf21786c/vagawuli.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/on2s1uqcenhpdk14lrolo6810j/rexemeru.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/dagoz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3cac21895---37062088885.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9f6547a4d62414461545a7bf62fb9dc5/tuzopipajor.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/40820991853.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4732086565e64907c900989b429f6a51/42626912322.pdfIn PDF document text
    • http://1careglobal.com/upload/files/49500289512.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48a9f316b---xemetukoxadodiduzogem.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a297629b---jedugoke.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/224a8f172bbaaadd2ba29a88d59a730f/dosiximegivimo.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/fososimagose.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e27bff2f920---52369336848.pdfIn PDF document text
    • http://jucal.es/images/file/donavegijedeti.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f960a342---17127327160.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1eab9c21e17f322a00c956202237a1d1/levedugawu.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/81677689914.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/88882646300.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 17396 bytes
SHA-256: c10994243fbcf9ee97b676b7b905739218faa0d3e0f1469c53a07b2409dd8b8b
font_01_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 11276 bytes
SHA-256: f78a29d9a59fd79bb72d694e585dca427f18ec62f2f07dc653a006a624d850b9
font_02_sfnt_off00014528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D39 17492 bytes
SHA-256: e0d9a15e964d5af9112548ba9141ac730df16156e4fda0abf400c60018ec2d55

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