Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b1b2a84ff6d3aa…

MALICIOUS

PDF

72.7 KB Created: 2021-08-26 12:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 662e772803109738064d80ee3a3befdc SHA-1: bc6082133da74995972981d84466f283d3be0743 SHA-256: 55b1b2a84ff6d3aaa8bad14b1a1cc3ffa20a17e3db14132beba2b306e96bb664
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0770cc6f9---tanivajakivepora.pdf In PDF document text
    • http://technocom.pl/editor/file/tasir.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/lakusolepu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/pabupawenewulalarutu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aee85b3b59b435f9c73a64338555cccc/xaraduturetimamopoki.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/246fa668461121bc15525556319638f5/34363375969.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7843a113e686443523434d208b05e9d0/balezolu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8119167123---49450453978.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/20840168863.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9493b74d2---sobebizufetovazef.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a1314994---15930645631.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2001bc43d---47074292748.pdfIn PDF document text
    • http://swhos.com/upload/files/fisenesivulodaw.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/10691619566.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210819_25295008D2158012.pdfIn PDF document text
    • http://iwort.de/userfiles/file/tubaxibamaxi.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/raxut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096632406002---xijotifilun.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18543161152.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/sezozemazagafinofaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=surface+area+of+a+tubePDF 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_off0000babd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABD 16712 bytes
SHA-256: 4fb6da2b0f7f4a27eb53bc105aad5c1e5215766e997b637b2a06661134944c53
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10236 bytes
SHA-256: 778afe07b644ac1d1ad5f693aaeaf57c875c90b56640b01af30a447ddf80da5c

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