Malicious PDF — malware analysis report

Static analysis result for SHA-256 575d8ccd8b8082aa…

MALICIOUS

PDF

98.4 KB Created: 2021-09-22 22:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d6f4a999ae52c07960fff38c9084561 SHA-1: 3ae9e49be969d552fa0920a0495300db86eaa633 SHA-256: 575d8ccd8b8082aaf7e2da0d9be709e175968c90da1b671e65e1ad0894e68339
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8e396ba6f5dd14a4bffaf6eee4b604eb/89629687272.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1ae9d5844c6852ae3472d1939560fb9a/96361816597.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tufiku.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vilomuzesixususadi.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/wubejoliputufawu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bf7d4e2dde733a40e456a0f8d8ad6abe/71344387191.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/7551575789.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f2dba234b71969397a42f24862eafe4c/topabemakiz.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/32197052604.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vezazenerozupilukilopiter.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/5412646068.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/wunika.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///82661606508.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jepene.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/gerilifibigirif.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912012507_d84i75.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/10499339163.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/venofomusoj.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/buganolemojode.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bc16077a---tufabolitegifofax.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/83343599104.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/mewutimawuridotize.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb13dbfbf---mojerelunodamekawikidu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/26416882208.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ab41c1d3b6fe47164e546dd42c0b5516/75817977633.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7002e6d---43004814047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=la+vita+%C3%A8+bella+full+movie+onlinePDF 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_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 10528 bytes
SHA-256: 64f04228ab3e15de14f5fef0ec17f3fc445086092ec434695a8eaee5414403c0
font_02_sfnt_off00014739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14739 19288 bytes
SHA-256: 15f730247cbcd02c5131bca91182b674ed680fdfb37f51be50205dc443723be0

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