Malicious PDF — malware analysis report

Static analysis result for SHA-256 1124af8fdf17cd84…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 14:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8914c398e78db5a8a841016406c24df SHA-1: fcfc5c83ebc90541ee60a2a1a3d4bfef593855ad SHA-256: 1124af8fdf17cd84e40f76c34509edc1a5c24b0e5c245531bb30199df85e26ec
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://citescolairedeledit.com/include/file/jarupanerudit.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/vudorimepoza.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lapeziwosibuxurizegufupot.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff159ce9b---zonagonujebo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073be764bb04---32598707404.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/36573107482.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/55949930232.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hkml1mncs9m4v0q288jie3oce0/belugapobuvezarokixekonaz.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8616581---pajejomakasigirapogojup.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/forulibabaxe.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/kopabutidiwikobire.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3e3ffuok08q4i51udp4mnunqv2/45991558762.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/45942675797.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/piridixibikifuxabawa.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210826193717_1atx3k.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l97fk4njn2aosvtevub7pl75gq/wetejobemosigevaluzema.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/32808067202.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f3a12a8c2e459e656c13949bfd67300f/11781479980.pdfIn PDF document text
    • http://heizler.hu/files/file/nibideze.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/23389098929.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/492f71b1e55f751a64323e7722e9512c/6289929498.pdfIn PDF document text
    • https://bliznacite.com/files/zetisaritiwunow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=diaconul+coresi+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_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 10616 bytes
SHA-256: 5a0075e464854ba7d07314932d9b57108d972bda3cbe37e118b12cc5dab26509
font_01_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 19772 bytes
SHA-256: 845665066ea8390feaaaa27b69f16e84ca90d251e01e8eaa4d4d644996a91e8e