Malicious PDF — malware analysis report

Static analysis result for SHA-256 22114d856f9d83c4…

MALICIOUS

PDF

100.4 KB Created: 2021-06-27 06:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bae5e6de93bb4eb7a280a39fc2ef50a7 SHA-1: e2902299937555f5fd0ea3a63e33b8bd30ebceab SHA-256: 22114d856f9d83c4e683aa033eb84e1b6ea70b61e5a4d720733f8460673fa16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://catamma.ru/uplcv?utm_term=surface+roughness+ppt PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac1ea9603---53031435476.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/53930344012.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6f4cd7e4---kojujuzujuduj.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7es2fptsgtfq73baiebbq0glt3/4382452298.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/50492323501.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/pelevoxik.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d9f0897341e963f370a81130b9d2d7a/bapobokojud.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/bajikagatatex.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/39051190197.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/55218606487.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/56dda679cd939f9611d58aafb0dc9450/wobuj.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/torusatitesonopi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f82962912c84ef2d013461c2d006d6d3/22229057010.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/22002636585.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1d1451706a978af7d8d298dcad9a60a0/57505058103.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ad6790a4b2f2b819e6d7bd0349fb625/13308959404.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73079cbc4---valukitafibivelafab.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/70822c263fced37cc63dbd07d241275f/lutujukuromebisumelo.pdfIn PDF document text
    • https://kermanrooz.com/img/files/5489505970.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/31d04ddb39005511ed2a0bf036324df7/90490654743.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/48528030774.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 17000 bytes
SHA-256: 45c1887a75a086cceec4ccd6ac0679824fde05fe934e82f8a66e718aa1cf2edf
font_02_sfnt_off00014750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14750 11640 bytes
SHA-256: 1f1b64e6fe9b2769bc2cb7def42bcca3b2ce4109cf556fddfb6cfd8b8f0790e6
font_03_sfnt_off00016b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B23 10796 bytes
SHA-256: 77327343abd7e7db64785faffe32a3322dcb7e77cdd2695a61929776b67c290d

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