Malicious PDF — malware analysis report

Static analysis result for SHA-256 422766f7454a145e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 19:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c85bfdb255009843c754d9c1ea5449c SHA-1: 21e09e84bddad8ead1dfc333b687bf34ae2ea675 SHA-256: 422766f7454a145ed5a595fea86c1d8bee86dada222d1fe288a23d0a19e75b8f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of link farms and the overall detection indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/eb7ec40dc1839d5a25854d094b75bb35/nebelefitesafajo.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087515d37858---46501553381.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fffe17ebb32316a2dbd0d596d3e36c58/makezotugilit.pdfIn PDF document text
    • http://effekt-film.de/files/file/buwirut.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/51653196441.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20756162834.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cf40ca1e---14799143228.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098e9904b376---92017892306.pdfIn PDF document text
    • http://furniture83.com/upload/files/40888412364.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/jabotujotu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/fadojunetujuroxix.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/juvexokebiwalamefamo.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/bozimakazisome.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jutiralekabu.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/19510298687.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j97oebo4n112ml79jilhlonsld/52582175588.pdfIn PDF document text
    • https://termofriz.rs//files/mivojovisele.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/93d2f5cc5e9303cec848d694d01e4d23/gafojonawod.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/darinivowukud.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/92512892548.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/68130808668.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b24bb59ac882cb1bbb7ad06da3cc0511/poluz.pdfIn PDF document text
    • http://jsdarvin.com/files/34346641788.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b03e5565---92835768915.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1f3b9c080f78197f11183ab775d1131c/mosawo.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/pijiribuxazamonebex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oil+free+air+compressor+working+principle+pdfPDF 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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11068 bytes
SHA-256: ee5f23cd2c43f3732cc92a8a0b1d2b47bb9c747d1fc7ad76513f4ff6028c8168
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18308 bytes
SHA-256: f7211e58e9949de08e05febbaf0ea64c84c16904a59e7070345920a85ea681aa

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