Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a03ab4487f3f8b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 17:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c8d44361105441cc978901607184b23 SHA-1: 1f057561f4ceb0ee8aa6638e430845973809622e SHA-256: 52a03ab4487f3f8b9c3244b27a677733f465b0382fbb420e432a8026b1767e41
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. The embedded URLs, such as http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4f3036c5---zumapenabula.pdf, are likely used to host or redirect to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://iglozawiercie.pl/zdjecia/file/33625283509.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8cd2fb3e8e9c5d4dab83d5c2619d5c61/rubitugolowekulef.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/23012423069.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/7620460188.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nowalepopujal.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/21978992080.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315627e0ea6---1988200642.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/kusojafipiwexi.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/60788444025.pdfIn PDF document text
    • http://ternovykh.ru/content/file/82205314948.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/70206592336.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4f3036c5---zumapenabula.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138334c25394---misokikizezeloposekifirez.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/penuzig.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eb227f34---bafixalovekuliguvururami.pdfIn PDF document text
    • https://wonkingchina.com/d/files/tawuperunona.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502acc0503---tujubelif.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/gibimitojebosativiju.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/12581635155.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904040659.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/29353204755.pdfIn PDF document text
    • https://path.mn/userfiles/files/56440725660.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/ketigadejom.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109080528395444.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2891b1046---xisazuweninode.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4f657d59902503e1b98b3ede10d034d1/nirazelekizogedotuvas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=game+of+thrones+gomoviesPDF 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_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 18548 bytes
SHA-256: 6c5f8c72c3ab33b28395be5cee4d2291450fd4c8fb097a57b5cd70ac2220af35
font_01_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 10720 bytes
SHA-256: 61b0a08d4e2441f10aeb9eb67af69a0a739df217bbede65540083bfa582a129f
font_02_sfnt_off00013f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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