Malicious PDF — malware analysis report

Static analysis result for SHA-256 805cdbe89e89ad56…

MALICIOUS

PDF

72.8 KB Created: 2021-08-29 01:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2682653b18ba8db64e1abbe0e32ddd6 SHA-1: 1aeab8e4dd3f3d18bb5c1d8dda2857dcf2b74fe4 SHA-256: 805cdbe89e89ad5683dac7bab4781e968fb8b9e642905ef141ad68abc2362555
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a69898090---tevarutiditemekoxaka.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/78095707527.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/salenefininituzi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d31b99b66599f0dd7d35497b3139e75a/mefebowamumixoliwa.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/batetasamijijono.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/22795005750.pdfIn PDF document text
    • http://wych123.com/upload/files/83984875354.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rinujurosaponal.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/79103176374.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/aa8c20bc79eb9554dca39c2679e62554/kofev.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/rukenudirevusidupibekuk.pdfIn PDF document text
    • http://thaide.org/userfiles/file/wuborevulipodop.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/73160568574.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405e4af85e---67456675027.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1d30b988---dusurevarujujafipaziwe.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/pezokanogegewagolasej.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/nepifumut.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/natalawilixit.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/65010748899.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3sft4c1sr4lie6jviqccq4qtm2/pawupasateziz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40381309389.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/mikebim.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/82196201439.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/60465175065.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610d95efc0f92---96281128077.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8161990d2---71373013595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=friction+force+worksheet+problems+answersPDF 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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 15444 bytes
SHA-256: debc7dbee954c06ba32c77203f197c2fb44b861cbc881bc33de3b80434278f5f
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 11040 bytes
SHA-256: 0e330203e86b2b94b718f48babc230dc015c6ec836c7db843c5e29d3ec7ba08e
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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