Malicious PDF — malware analysis report

Static analysis result for SHA-256 e016c05df1ad4982…

MALICIOUS

PDF

98.7 KB Created: 2021-06-30 09:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d37adf94ae78f5e66bbbe22f26a583f5 SHA-1: 4ddf2e97ce9d681957d246c2d589f11ec311957b SHA-256: e016c05df1ad4982ecd9ca7e72742983fbaf2278134a1b353fc415216575ae41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 http://ajivikafinance.com/userfiles/file/96677715166.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/33876965346.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/resozejudaj.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076106c002c7---17675300521.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4793b77e7bc96468f5f16a6e9c1bf462/gazamalagegivijuwowo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wukiwupam.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/82l08tosrdk8ro05on7f4o6q9g/66309779345.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/10971109954.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/taxozuvixuju.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4687812c---59792936554.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/mezuled.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/96368871845.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/776c83d9d45f1aaeb7fd2e7a6c242338/wetafux.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d577c027df---69226827015.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f674271b1---47921433203.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/32cd16dfed745dcc22b7e415eb0ebad8/77135138928.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098034faf585---9463727675.pdfIn PDF document text
    • http://veribase.com/E/file/bumujazo.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/gesudepuvilidi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b65945a1e81---powomaj.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/lefunub.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5ea940b8---81363998886.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607177c21a9a7---24076861970.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757e42bd983---kemamibomu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb7295f7e5---29437404219.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qlqstsgve3c8cua76r0nd4tugv/firanuzuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sonic+3+and+knuckles+debug+mode+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 11096 bytes
SHA-256: 2131410f9cffddf4ecab714363de4bdd1d9d0cefc702d626c127b485f1057cfc
font_02_sfnt_off0001425d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 17476 bytes
SHA-256: 814fef19365afa9d1f14d0004d2b794a45efbd322ba263bcdb255ae89ce56f4f
font_03_sfnt_off00016faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAF 2620 bytes
SHA-256: f0eb3e610359d1a2d394c8e54ad73ecee8df7af2f40ce00bbe706b74fd538ffb