Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6da06f4512528b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 13:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea8ea6b19407d9a09248fb7ee7411bdf SHA-1: 7fcbd03ee3e27d52dec0e41e6d7588be24b1d93c SHA-256: ba6da06f4512528be387ffeb670014b8f46e659b0241bf39a3e560c0293b3934
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that these links are likely part of a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deltarents.com/upload/ckfinder/files/suvuzorifez.pdf In PDF document text
    • http://studiotrusso.it/userfiles/files/bilozegem.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/30823847501.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/jojewubozuvepesinewef.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nulebejimejuzeguga.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/63495991230.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/96606228855.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xoripexexixuwog.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210913081423.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/45098120924.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zugimudapimidilemuta.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8foj5vravvh2chdmvlcs9lnr12/dufamepenaxorom.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/vukaroj.pdfIn PDF document text
    • https://vleek.com/uploads/files/silidipenavoperorowo.pdfIn PDF document text
    • http://360global.ca/userfiles/file/5936830525.pdfIn PDF document text
    • http://cabini.it/userfiles/files/wekilowalozufonuwo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd975af356---28912515505.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/jepudagufidorazaropar.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/20121427608.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd402d18a---fudabepodofirugobuxumim.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/41302160a1b8b29621650c11dbcbed61/nijizadalijebimoregogaxol.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/23808972829.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bk0bi44n36qda9f8vfpkptlds/puxemajaxojizop.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210916_141111.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613966b4114e5---47453224151.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/31800401213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=critical+ops+ios+mod+menuPDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 17312 bytes
SHA-256: 45c09fd82d8f45c3e057d339b19211c31c12056dccc3f9693654f6ff2ff8fdaf
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10804 bytes
SHA-256: b7cddc1e713d79c24963fdafbad51f6425cfd90cb3704616032fc7ddefbb78c1
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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