Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca302ed183419acf…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 02:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16d68a54c211715e3ac09b5975ac12b5 SHA-1: 72d23c490b2cfa6d0eb99b860f0fbce442a6fb39 SHA-256: ca302ed183419acf384e71259b9a89822ad1aaf05fdb38b060eedfc7c45e1e36
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several identified as compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://olterus.info/contents/files/5926605922.pdf In PDF document text
    • http://textingrights.com/userfiles/files/zowoseranamupuposiw.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/zarunuwapi.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/pulizizef.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/xowiripefitit.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090720190971.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ubdv3rk8f4gssqv2pp2joaat9s/25643980428.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/25134943773.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/6585234943.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ropupifixowef.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/91205835631.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/wudulajojorujubidofana.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa4be96af---femogifopar.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/28419844040.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/rakobukolujimajovotide.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9486fc0e80c2917de9175ea33231789a/muselizabun.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/nosetasaterininiji.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614192bd88068---23061937006.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/19825413541.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/kefutimotexivuwafoxat.pdfIn PDF document text
    • http://istruttorecinofilo.it/userfiles/file/kirurorotereviximadet.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/wetoxavutilojurilovekux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=yt+music+premium+mod+apkPDF 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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16120 bytes
SHA-256: 0e968c5d69cca1a649d36dfe6d5433f2e9a0c2d74bc23b689af1e01b6970fd79
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10700 bytes
SHA-256: 36a46aaf5905b1acf6383152fade6c45ddf4793ab05f01ba878b293b9789f576