Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cac5b786f16e2b…

MALICIOUS

PDF

88.3 KB Created: 2021-08-10 12:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 376c6ac7dfd02d327387cf9811ecdb80 SHA-1: d96788ab9f876ecb453a9869cc8e1ab455dc74e2 SHA-256: d5cac5b786f16e2bc11a818fd7f7a4df0a5cfd10aa084543a7d7616862251418
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to other malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://drivetripper.com/userfiles2020/files/wawodoxeguvoligagenadita.pdf In PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/bedenoxodofizinoxolidago.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/dafeveborewudozele.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/093e1bde5e2f1a83b2f03d5c51a9c47d/medifirofenunufifu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vfugtlnbsa7hej7omog3sgf3u6/zinenimujivixuj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083a29c41a4f---junejumofe.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/18933658276.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132cb2e0bb---43675200229.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jolosirobenofakakib.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/96147906788.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae9mmb24jnulatusc2tqlccs4v/retalinu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/99b28018622b8b0e18e591fae5cc9497/wilowunabaz.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/pewodetadun.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/ramawopovilamawu.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/55633989653.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/56176552034.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c14602908---33103289153.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/buwirugefepetejupugajepor.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xubujotefipotozalazi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/nuwosadixokutube.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c3661a7c---tagusupaxekiwumolo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb5d7a7b---gijagarisij.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xuwupalemoputigul.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc9128b6f59f2f3285ff4a574adec039/79822134116.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/74922466669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+cheat+on+schoology+workPDF 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_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16496 bytes
SHA-256: f9c1c574a17286e02fc091ffcd02375ab23ccce90460f026533ab0d334a2fe78
font_02_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 10700 bytes
SHA-256: 920cff14d58fa88dc66f8d191347eda5f1d81ea5c095172976a20e5b3ad99e06