Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71c9df24271cb0c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 11:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69968d055a9c3a1d6b73bf6eb3288573 SHA-1: 7c1ba3a290fc6b43e07cc94ca3776fc9fa09b26a SHA-256: a71c9df24271cb0ce4db8fc860ba8cedaa2fca414a8034965dcb8c5fc152b96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the document's nature as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://juha.be/_files/file/55864128837.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f471922b657a340fc2e1a0b8c3e29f6/nojatunigapoxix.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/guxefuvupojeli.pdfIn PDF document text
    • http://geotersrl.it/file/rekexepolemowewigidejew.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/karokodadoruzalapex.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/53475184502.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/zapoxuziniputatowafo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/33112727770.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/32623556156.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/35970498306.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831570d3ee---gigibakedajafivijesigo.pdfIn PDF document text
    • https://btegypt.com/file/nuwexewiladupola.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jinadifederamijuwuvulagar.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c970eb9e30e---sexijadetonosere.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f8ac80488833920a925bb2e18b6cba1d/zabagamexorijomijuvowe.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/83534989139.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fd5fbfb0a---16876457400.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/67v066o9fp921ob1hs3r43mdgh/37347916924.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d774cde14---fadoxebokifejukokurije.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/menigiwefuvifixuxafumu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbf397236---giditovasib.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lujoxujojarogibazad.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/losigosisijo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf19df2e20e---10381374416.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609773a251e5f---bogexawixoraxozikanewa.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/65137412003.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c3c1bf1a---31180951235.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/10403330456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+notes+pdf+class+9PDF 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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16576 bytes
SHA-256: 94aefb6f296955645a6eda5e78a02502096fcb3653c45a3cd64847cf6ac7cb9e
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 11200 bytes
SHA-256: 5adb3185389553c60cb618315e9dc8e39b18138103ca18d125fd8238cc0eccf7
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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