Malicious PDF — malware analysis report

Static analysis result for SHA-256 16faa74a99cf0a94…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df38ccc79a2527ad388906f5b80b20e6 SHA-1: ea24d0eab325025f775d0e468c21c48c81dd1fcc SHA-256: 16faa74a99cf0a947ad64715313462a22af6822872499e5b2412d816aaf0d962
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely serves to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ambvetsanprospero.eu/userfiles/files/midubixowoxizujojibiduse.pdf In PDF document text
    • http://willajarmar.pl/userfiles/file/josuvizal.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbae1927f2---93352868095.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/59362786808.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/231af8ae60ed66bb15d7f6d85ff7c435/gaviremulagevukoru.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138867d92e4e---muzutuxizi.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/xedepizurizotaga.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/wovinidotuvifebomunemetoj.pdfIn PDF document text
    • https://anakmeong.com/contents/files/35042105247.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/kezurikijoteliwevapof.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/9172883332.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fijazitezutewagufaxipezug.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/71623110785.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/rezefurise.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/37379802600.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613483ea7b778---13675199863.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/vivezukiridefosunijemiko.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/48951863972.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peretakulosasa.pdfIn PDF document text
    • http://recrute.fr/files/files/85004772827.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5d9f01d774879dca1d6a798a52342d01/90662692393.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b040f8ab4d---jafesubikemojamuridoris.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/56049473457.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/13815990257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=app+lock+ad+freePDF 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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 10224 bytes
SHA-256: 7dcd0f8add09154c10419e0eb06c4b97d4bd04c5c030f4527b5b3189d713c573
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16512 bytes
SHA-256: a3589d9d9dc5edbe9c0a1b3700b2eb3dd5357436179477f50cd7604e46967552
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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