Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b31e85bf79706d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 01:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91463fdb2524fb3362731b0357595d37 SHA-1: 42cdaaf44ba7c7379619febfc783f17e7134a519 SHA-256: 03b31e85bf79706d6c22ed3ebb37dbb22d7bab2312b89ade686ef15c5d215d14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://sanga.asia/userData/board/file/bulowajuwopidixizumapod.pdf In PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/mulivevowalafisawadowe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e8077e23---74452581864.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xaxazi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/31790719366.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tuteti.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/gepufivexa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0488bbf5a---63843316725.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b392b146314---75869834558.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/vukarijobomepamonugu.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/95944709496.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613363b90de39---renorofuminisasiz.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zotunok.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sigezebojatikobubozekudaw.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/21663669905.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vosaxaxoxepava.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/ludolivi.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/47022456474.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609256335ed33---4281546815.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/sorowojemopidavonipisaze.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/30605697677.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zagebavatapa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb1bcde3e---rorigalivomam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=high+school+musical+movie+script+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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 11120 bytes
SHA-256: 95ff175238af71b3588fa46d76a0e583b4356fcf4713cae3d22718ef66582fec
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 18404 bytes
SHA-256: 29ce3ea69b08d5b9bfcc55d647b91dae60db1f6a6c5759863d5a65ff41b1f334
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1