Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d005eb97a22dae2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 19:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8be0915f9a909b2b81a150033146cdd0 SHA-1: 2568ee404b8a1f8280138af56271c8ff002d1d2a SHA-256: 1d005eb97a22dae27d458ffbb685b3c5c3f6ff26f99f882e1c1f1d88cd272c73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. Several heuristics indicate the PDF is designed to host links, potentially leading to phishing sites or malware downloads, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://smidgel.ru/uplcv?utm_term=minecraft+account+premium+free+generator PDF link annotation
    • http://www.pranabkumar.com/fckimages/file/39102828523.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/nefarisa.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56843553843.pdfIn PDF document text
    • http://chemicalengineers.ie/images/juzogefoxizuxi.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/5463163076.pdfIn PDF document text
    • http://esipro.be/userfiles/file/wisesowopafoduzogakus.pdfIn PDF document text
    • https://birudongker.com/contents/files/roradodanasekubuxilili.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/jonulu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/sarab.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/57602955731.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41146164738.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/sofuta.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613992dc5d7fa---6266120435.pdfIn PDF document text
    • http://evola.it/userfiles/files/6632046905.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/96146713917.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11222246880.pdfIn PDF document text
    • https://sealskinz.ru/files/file/76399273813.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/fulug.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/ludukosumedesi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613211c5d1783---5181037032.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/galavumatafuj.pdfIn PDF document text
    • https://hse.tw/upload/file/burunezewi.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/89803073679.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/21034150682.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_off0000b4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 15756 bytes
SHA-256: 55b14c413aeee417febbccaad0b0d3c92cfff7e0658b32eff670392fb05510e9
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 10704 bytes
SHA-256: f601bd2a24310232a68719af449bc6ce4dd92a111da8863b4289bd913591e750
font_02_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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