Malicious PDF — malware analysis report

Static analysis result for SHA-256 123844bad1efeaad…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 15:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 33af63223fd9c1de54c32bfc0054a330 SHA-1: 26b6ed63924b286bdd3cea0002e879e3cb5c4e35 SHA-256: 123844bad1efeaad367d445a27ac836d6f3c8a97ccc265b36638d1d10f278661
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dentherapia.hu/files/file/40152964013.pdf In PDF document text
    • https://ijpdua.com/contents//files/zejujoxunasififubuwezabiv.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/buzofonijugepexarelo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bec04ad5898---24593171964.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ea803cd7afb7be6789cf91da597b832/wuxoviwafidumup.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/87593517101.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210513022427.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/prjao1ltq6t4m6rikk6j8dekej/zixanimipe.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mqjntredab8ht78tkbhkbgtvth/kufuvuturuxavedufegi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082786149fab---62547773376.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/50131967478.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf07a756a---83106860904.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0523a0e91c5944b0f73f78588ca7741a/682405095.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/tixebimuribokokebosuxivar.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/80849554618.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/salisofesepozunijug.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bogebowefubafelazikulop.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8fcbh6s85v0iqe7nb39bk232d6/mefaleturuxeviliwukeraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=game+centre+on+iphonePDF 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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 17288 bytes
SHA-256: 57956ce51930e59a35417ed6b7d9e96023e4b5d594c9b433527fa3ef23f610d3
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 10464 bytes
SHA-256: 77218ae285d3b2aadc29a302db86961597dbcdcdce6dc3ca33963f39bfaf870d
font_02_sfnt_off00012f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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