Malicious PDF — malware analysis report

Static analysis result for SHA-256 e261b1850caf70d3…

MALICIOUS

PDF

85.2 KB Created: 2021-10-13 20:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d3c04653569d1f8c57522d37105ff24 SHA-1: da95816acd74e965abe671670c35820f29df63a4 SHA-256: e261b1850caf70d349966358701e7bdcc90333e2c558620b86d848105a24cea4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable domains, characteristic of a link farm used to distribute malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614285e9ab322---54170080422.pdf In PDF document text
    • http://cityclick.it/userfiles/files/31091573818.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/nolozigemelivelataxufigop.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/66733612788.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/romikigumetinozamezes.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/25021791795.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/fobuk.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/91075960685.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/bijoroverigukokovoruliri.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/97992560694.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/45896385204.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/mibeduregilumakagukob.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/93415405871.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/12640619098.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/sakovavidulamezudixatefo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8bd65cad---wesunom.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4e5ab9989---kixamizuwomabimawe.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/wupukevelozadu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/66434783200.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330f7eb11d5---fezibitepatowuv.pdfIn PDF document text
    • http://metabolit.ru/files/file/vasezejuro.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/60622444353.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/20104303943.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/20920599810.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=i+go+give+you+my+heart+give+you+body+do+anything+for+youPDF 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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 19060 bytes
SHA-256: 7dc9bea111dabf13c31fa2cdfd1cdd5a12c93a6cbbef598b70f557023a216c88
font_01_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10956 bytes
SHA-256: 99b043ed1391eb4b7abd610e2aa4f38f3c9b79ca79c8c8f672d460af72c9b671
font_02_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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