Malicious PDF — malware analysis report

Static analysis result for SHA-256 632d173d07c2084b…

MALICIOUS

PDF

73.8 KB Created: 2021-08-16 13:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f716623eef33037abde13935040b1977 SHA-1: 759370b3a55219cd29c7ab5fd411de28794bae4a SHA-256: 632d173d07c2084b320d40e9a267e3a01752c90c27f99d8a02eb9747c955692d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning attempt. The presence of a 'download' button lure, combined with ML and ClamAV detections, indicates a malicious intent to trick users into downloading further malware. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=digital+systems+principles+and+applications+11th+edition PDF link annotation
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/fuwupugofamasuvoliki.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/51254275739.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/12060928309.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/dakutatavefexedabupube.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/43867654466.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ef6fa763c2f43e7020a060157acbe040/44899088852.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/21914479964.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1628985623/files/fokirenaxepimeweguju.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6c4ac3digoeqvcsktnrab4a7pu/zexopuponewonudi.pdfIn PDF document text
    • http://faradbox.pl/files/file/65443877523.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifoxosimadisoneveveteb.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/vimajebuvorunevinevar.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xamiva.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/47081697553.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/gosuxuxexesodewun.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/wenojepaxokujidajimupu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58b0a43e6---wobupidemizekexoguwofakap.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/33656650354.pdfIn PDF document text
    • https://digireg.ru/upload/bofasedividuzevexikugo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jadinuzimafapilunumakuw.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/64594500773.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2fc1460d2a03bf78e2ec2da63049012f/16475884914.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a082e9bd661---vokirixuwifizixeso.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/samj53387ikeaboj6kai9v3oa0/22078965920.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_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 11128 bytes
SHA-256: be85f7f61524706e82249a13e7bba83aab1dc81f8a55b7fbf0b53e3a34268b58
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16204 bytes
SHA-256: eac75dac013bfa0df3db5fa545a88dbfa932ec461b28a85c2d13ec4cfead4b11

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