Malicious PDF — malware analysis report

Static analysis result for SHA-256 2538645b76dc14ef…

MALICIOUS

PDF

92.3 KB Created: 2021-09-01 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2f64b04ba5cb9f2f95166eab0b64a872 SHA-1: 05197b7e436b0c373a48f223e59815646dd759c4 SHA-256: 2538645b76dc14ef95dfec7a85e110feda3a31bad7fd9dec29404d57deb051e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. The presence of multiple external URIs and link farm heuristics supports the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ambvetfanini.eu/userfiles/files/neveburitufuwopazuvesaru.pdf In PDF document text
    • https://hostingalani.com/calisma2/files/uploads/17581407220.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ba42689bcba71cf12586003f3388eed5/juxijumap.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/54128479622.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/liruvunexuxewowivagodibe.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/duxovenesazopudepedix.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/43440856295.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/jebiletiroviboxewexel.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/tatuturepunudirexuxuduvum.pdfIn PDF document text
    • http://cissi.it/userfiles/files/78979819587.pdfIn PDF document text
    • http://orrizon.ru/images/file/xavuworatawufuluxobetugob.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe311b863d---28741134980.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160809e74e5926---bukugigawoweparijeken.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m4pjm3a56h6orpjdiqlqqb7084/78110005348.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5c39d191f---7843026123.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/78545541820.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052518103673499.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86218610773.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b7d5165feb268024059156056ad965fc/87950482766.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/31403729070.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec2c5966a---xodefoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=world+physical+map+oceansPDF 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_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 17980 bytes
SHA-256: 92055167898fe9e3102b488f2d0c1b05b03178467da4177516ff3d68cf2dc8b2
font_01_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10788 bytes
SHA-256: 9a1c0a955666bbb43d3f714591406d340a2f14cacbc2c09952fa9b78efa8132d
font_02_sfnt_off00014bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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