Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aee89496b12ff2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 06:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 91e6e7f9ccfe113d666acf20ed53dea0 SHA-1: 8590b823abac3bf3677930085fb3cf008f010b66 SHA-256: f5aee89496b12ff2ebdfb5de804a0918ea84353fee097ddbc24459403c95e126
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a screenshot-like appearance and embedded links to external sites. The presence of multiple links pointing to potentially compromised CMS uploads and disposable hosting further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dd-eng.com/files/files/49930171250.pdf In PDF document text
    • https://tarzminder.com/resimler/files/67192372080.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/rumineraxebisubiw.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/95069642975.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/sorudumowaduxomopuvaji.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/10326910572.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/niwibagipax.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1615260e8800f7---tibudetere.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145caaaa73e6---puwolududo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/39244537782.pdfIn PDF document text
    • http://gtshotel.it/images/file/ruwalotupuv.pdfIn PDF document text
    • http://arucax.am/user_images/file/35862912197.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a2af8a1---wepivazasewisuguxojo.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/totejapomusugakenen.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/40894741172.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/86592500629.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/pizotibozivimo.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/torogulituxakujiwerenumin.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tusarebufominoxo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/85846291250.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136937a78fa5---35221418968.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/dusinu.pdfIn PDF document text
    • http://langmypham.com/luutru/files/7385583823.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109131704507774.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109241046216757.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/daxekajexaxofozojugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=history+and+political+science+standard+10th+digest+pdf+downloadPDF 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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 11264 bytes
SHA-256: e4126385d24e73778ea31d5ef1d8e4a71ec1eb45435f912a3ced3214fa235f17
font_02_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 14332 bytes
SHA-256: 8964f51fc2ab76b8d319a6212697c1c21a013b7578390145dccc6886d38573bd