Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ee84ccd379d17…

MALICIOUS

PDF

106.0 KB Created: 2021-08-25 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75cb2c3b83f30abafabe3a6ea41ac08a SHA-1: 462602a7fbde37485fb11d433df42f1c3fc648d3 SHA-256: cb5ee84ccd379d17a79d9187ac21b5d495795b95cbab95707fc64a386aff5fd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=engine+bay+cleaning+service+near+me PDF link annotation
    • https://blindnow.com/userfiles/file/worewabadugojowafoniru.pdfIn PDF document text
    • http://idroter.org/userfiles/files/57747708296.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/77455305557.pdfIn PDF document text
    • http://martonelektro.hu/files/file/zujufifusaranile.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/zenejawigipurunojixojanib.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/nademimokapazu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ad30f3e4f---97399570805.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/xoxowe.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/gejuranut.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/60902115955.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/26862731627.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc2829f3a---65293151050.pdfIn PDF document text
    • http://geotersrl.it/file/2461106854.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jopawusolid.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/jifomo.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v58co153d1tpu16igcv592e040/87080066007.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/e5op2s874o28c65o39aauud41l/seropofuzuw.pdfIn PDF document text
    • http://e-hane.com/files/rorudoxedebobupiw.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/85402260654.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/26856536190.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160831676837e1---kimefiwub.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/69658361702.pdfIn PDF document text
    • 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_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 10660 bytes
SHA-256: bc57b58eaca16825f5f9dafb85f6887bfb243d216f3c3f3cc624c0667701db6e
font_01_sfnt_off000153d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 17532 bytes
SHA-256: ae92c91dc6c24fc5699551e2e6641e0a9eff0c139d6fdf7fc98b149f4e8930ca
font_02_sfnt_off000181f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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