Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76816530fe3e2ca…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 22:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da1f0d0b5b958690af28a257034e59c SHA-1: 87f15aefc5ebbd225116c6f342e750a454a1dc48 SHA-256: b76816530fe3e2caf71789def34d5b4c01ca3b9aec501ffe993242dbfebeb7e6
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a social engineering attack, specifically a 'ClickFix' variant, by instructing the user to execute a command. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly suggests malicious intent. The primary goal appears to be tricking the user into running a command that would likely download and execute a secondary payload, as indicated by the SE_CLICKFIX heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.pacautomarketing.com/file/werafudujezejowot.pdf In PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/55075285103.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/945798241.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/2168022394.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/13119026753.pdfIn PDF document text
    • http://sswjeans.com/files/genetemafamuvanim.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/9253852441.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/97479055655.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/31726976242.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/kesilukivusemazakaki.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9887ad4d---9504070577.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf2bc0389d31160645034cafab664e87/fixaniga.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/potapatuvafewati.pdfIn PDF document text
    • http://millecolori.it/images/file/pawakipanurutirebizow.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/77352620560.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/59899786185.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bajegafarodali.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/julewafolafumo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f103ae1---rasinenonutirunigazimi.pdfIn PDF document text
    • https://nistd.in/userfiles/file/38818420442.pdfIn PDF document text
    • http://ativn.com/upload/file/23907218635.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nakula.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/mupidupowaler.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/94499766279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=save+editor+fallout+shelterPDF 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_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 19152 bytes
SHA-256: 44670f9dad410f38b9f1dd9408dbc6c57b2f78c19b887908c4e2f1f15e204bba
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 10588 bytes
SHA-256: f49d8b779fc2b95d6a1b6d00e84094cefa8d4ad1764a5d8ab0b077dc465000c9

Open this report in the interactive analyzer, or submit your own file for analysis.