Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296c1e14d3ade95…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 23:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4248ee90c2720c294f3770d356d4baa9 SHA-1: 8c408ca05acc6c2e39c69e6feda6d02c39e0a0dd SHA-256: c296c1e14d3ade95217fe312f1cd683bea417ef982ae3d27be42776a4fb6bf28
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of a link farm heuristic and the overall detection points to an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sloplast.com/userfiles/files/vewexobamokekadobuzaza.pdf In PDF document text
    • http://szilasfood.hu/pic_upload/files/83302603448.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109042358303175.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/14458335864.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/timotazumow.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21701351157.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/vojidukaxaseti.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161322e2e075f3---91536514702.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090217333059.pdfIn PDF document text
    • https://robertbah.si/files/file/44950272964.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86c864eb76c4ad910d9044df6e4bc56d/78645335236.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/kozunup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134423243800---10859221972.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/nojelajebu.pdfIn PDF document text
    • https://felicityokolo.com/file/1123749081.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zipatosowoxotigagaj.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/18102884877.pdfIn PDF document text
    • http://cwesp.biz/upload/file/56839019128.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nugeze.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3611a8e8c---jojidasufi.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/88423527852.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/katamuladixeroludin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe1e36510---97687796821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jewels+classic+apkPDF 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 10116 bytes
SHA-256: b48d753f046eb56c66c1bff8ca12221ceab4a97099506849c145a1df6265e5da
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 20024 bytes
SHA-256: 7ecab799c80f391435e8ddae41aea28bcfa12bd68cd92db8228db4bb04678bad

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