Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bdb5ec6a8b9b59…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 17:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 65ed060c2d2860dabf004c6300a16a75 SHA-1: e06b88cc853caee024d3f110267d2be9f985f63e SHA-256: a7bdb5ec6a8b9b59e97e9207c7d3c471c91c1ba1fa16a75c0e8df4db179e6ead
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous external URIs, including one directly using an IP address, strongly suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://arohitourandtravels.com/userfiles/file/betejavekoxin.pdf In PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/fidotopuvebodenopidu.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/11889959206.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091809133170554.pdfIn PDF document text
    • http://fkhd.cz/data/img/dugasizuliwemiz.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/xujilideputuwi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f4f4f335355b046c26674c12c7798f64/zososetexuso.pdfIn PDF document text
    • http://strap.sk/uploads/files/44510190889.pdfIn PDF document text
    • http://peoplefoster.com/pliki/kowevexise.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439826fdb7---74168057423.pdfIn PDF document text
    • http://eva.am/files/7a30a7fefb330889.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/6224158305.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b997432---neterena.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/26396468178.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_122449.pdfPDF link annotation
    • https://castilloexterior.net/ckfinder/userfiles/files/34884934234.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lidam.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/68687247875.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kosovebewobavogotuw.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/47255318269.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050103451653.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/pimimegonibobipuki.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gevodoromumibob.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/56428720169.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/benuk.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zititarefomuzemubunivolux.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46195a84---tenovuwimujatowan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=paired+two+sample+t+testPDF 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_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 10536 bytes
SHA-256: 6aa814034c0be4dfec0c76e8a55b310d26d010bd1a187b233db2b46168184f94
font_02_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 15092 bytes
SHA-256: d6107a974448acd3601779a98baf7a951d5178758d7e6f9342fc0e368cfb4f8f

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