Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb497addfa398279…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 10:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e41dcdd8f9f7279925f918420dd75d2 SHA-1: e1c9a53a91fb8b2b54e499b41cce0292a1c3721e SHA-256: fb497addfa3982796186c06f290ce4f195ab32bdd081bc6c598aff30387c0a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://morecoredesign.com/images/imageUps/files/sanipavasitem.pdf In PDF document text
    • http://www.bash.cl/media/file/16677794592.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/veragolazixikarunu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/19269613629.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/gusitepovidu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133be4aa0f48---samemepew.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/43160579418.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0f33468f---suvijodazajitaxopapakove.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/zopufukuveve.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/nawumonuwisozudajagegoju.pdfIn PDF document text
    • http://okvin.org/userfiles/file/jemitefune.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zowekozexetamop.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/90341659993.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9390c8de---41612195709.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143399a3774c---gikunokorovididuwewul.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1b7970e0---mimotopupusobepamugiwaro.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/30855656357.pdfIn PDF document text
    • https://trystsalonri.com/images/file/91186485781.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tifedux.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/favotuvitifakoxewekukis.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/bexonafofexeralutis.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904213153755064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=artillery+brigade+android+downloadPDF 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 18408 bytes
SHA-256: e068c3049f900f8890fe8ba6015635a9007f74ccc63f1a24ec89349e53f086fb
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10576 bytes
SHA-256: f81976259ccda9829daf803856d0b1049de458c4fa9cadc3e9ffacc09d2ed46c

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