Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23faf039a30403…

MALICIOUS

PDF

74.5 KB Created: 2021-08-28 00:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfa76f2e7d7ca5f1b6f58138b9a125db SHA-1: e66b4c5179e25e8ed85813a9e13c35e89bde4967 SHA-256: 1b23faf039a3040331a01e0cedd6108dbbd70c93c8c6e71ffe59ed0912953181
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 file functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c4189901---82380984553.pdf In PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/55126121458.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/78340689046.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qqsdhdki7leq442a0ensv4n47o/xasuzibemikuz.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kivozo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed319e4802---59411326171.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/76787951620.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/60728663535.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/h9lbendrve5q6aguhjo34fsvut/35965768246.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87218b3a0---nutes.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/17909892271.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/d4e43912cfd6affe0e73c1d9ec739a61/55666264804.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/mosebokatel.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2ce28f0ce---kefojogikowoxov.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0gf3kjdu8mil5pnopcds3k9rar/nabegatazoridadatijixu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/313f4f80a8f6eb864d45e5e98230c659/bumifeberorigibefinidib.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vulupuge.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sivobebinulexemijeme.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/26181171214.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gurilokamekifik.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/tanomosiditivafadodijeji.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jmin74od8pl87m3fa9s4ckubjj/3308507146.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39736769406.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tulutixodesefoniwudogewep.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/efh7s8co58ussk3v33ouak4h9h/liluvaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=swot+and+tows+analysisPDF 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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 15596 bytes
SHA-256: 92b36d3e555f79b134459b568d27c9d6e7932c6da5063b60e401c67e54e96d27
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10284 bytes
SHA-256: b9712bb54d650f1a630ac44032c470fb7f749a1133ed2356607f803079ca6055

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