Malicious PDF — malware analysis report

Static analysis result for SHA-256 78550aeac31483de…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 05:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e02b2432f9401ad1959732e866eb3ea7 SHA-1: af805f4f993429fbe6f8dd251d58cfa06fe6c744 SHA-256: 78550aeac31483dee5d675f1cd0fff085100088a6b14f55bb38c21e1f4bcf327
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and URL analysis strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://holzbau-napetschnig.at/22333576694.pdf In PDF document text
    • http://macabrey-luthier.fr/data/Files/nobaxejo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f05031cb---berojidiluresorimiwofuv.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/87701237675.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/40808769259.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zimavogiv.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/41653098141.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/zapupufetutoji.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/fijavegekitokimini.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8d957bd7ab99a950ff7c4c5afcade8f8/lulotekuzoxijixir.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/71315275805.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68804402388.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m5vgfdudarsg698onmg8povo04/nugudar.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b558bde3e---revupepalog.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/30618538025.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/zemabalale.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/rimuwinasamovurorulejuwe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e9c89902d---93106185179.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdfab5847---tudemovasev.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/52819519089.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/xufisamizuwuri.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/56762866229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=determining+elevation+by+reading+contour+lines+worksheet+answersPDF 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_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 11416 bytes
SHA-256: dffc5d39824dd150294cc60848c235fcc6af645191377b9cba5c5afdfca35729
font_02_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 19212 bytes
SHA-256: 662d30cb1f0efeaea8c54d01794913f7758fd02657c511458d21f19ab55c9bba

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