Malicious PDF — malware analysis report

Static analysis result for SHA-256 177e015ca86688d7…

MALICIOUS

PDF

91.1 KB Created: 2021-08-20 23:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de3be38029176dc34e9e9df92f165db0 SHA-1: 09ba4cf3ee57f598ac2793bac5bed62ec978b0c9 SHA-256: 177e015ca86688d7c79b01899dfebb2e80745f2072dbf3bd2f4905c07243d222
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing JavaScript actions and numerous embedded URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The URLs point to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=historia+de+la+medicina+manuel+barquin+9+edicion+pdf PDF link annotation
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/b6eff397350694a702f3e5a400f6a2f6/tebanul.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/98776308061.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/7558817430.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/zafusabobigewezomaribesuk.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/bewuxopuvixezemewunaj.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/71725066255.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5246e1923f496ff2919f6c84d43d3b8b/53975312301.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/lizikukaliposisevuwivuxe.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086660159321---43107524261.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b51785fc---83315399657.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/99089403575.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8a62c728---rolifuzubibijexebigusovid.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210805_170116.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kizog.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e771393f8d3---lemoguzisoja.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/88887426904.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/wokumegatazax.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/32872366768.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ecd3b4993c5d9c6526834935732f4cb/92041656345.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/3903609370.pdfIn PDF document text
    • http://kingnature.ru/files/files/kebunuxosewovibenibe.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vemupukakemimivofavumis.pdfIn PDF document text
    • http://caramelitos.sk/files/4774132697.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 17824 bytes
SHA-256: 440e586cf9b72fad2776eb5075c4ae86c79de8073c573ac35ef84ecd42967285
font_01_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 11324 bytes
SHA-256: a2a683366b23e0cb3e4671d337fa681fcab81e5c5b29fe3011255a38e2d4e4fb