Malicious PDF — malware analysis report

Static analysis result for SHA-256 93adc2344ba9d460…

MALICIOUS

PDF

149.6 KB Created: 2021-09-01 03:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da164e05b44f27499bffe7affa79470d SHA-1: 81d10d39569c3af4c84dfd3ed55bad593998b53a SHA-256: 93adc2344ba9d460f2829cd0ef1e01d861af26cb0c420d2628ca183ad9c21572
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links suggests an attempt to create a link farm to obscure the ultimate destination or to maximize the chances of a user clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=bengal+cross+kittens+for+sale PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/fezisibine.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/gewaruvilapelazeru.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c8b59d63485cf824fd68a78f2cfc3b3/femukefufalelemigi.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/33746094795.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/kiwiwupigeforizadoketusaz.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/ninaretamavusefenowowozom.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/75012583375.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wefuvibedewabezun.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119639b02a6a---zariwetilamuk.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/nimugowukijujukoroxafi.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/fejivofevoxitubexetuse.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vl9t9mu71rbsp8glenfq45l1v2/44725027127.pdfIn PDF document text
    • https://bataretak.com/img/files/file/97664094296.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gemaladagufu.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jipevizeweju.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/37492982377.pdfIn PDF document text
    • https://telorgabus.com/contents/files/tosipamaxotatigari.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a7805261---makivaladomerojujupanafi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/umdsmvrr4mal2u1vd227t74fa2/wugajexuwidizagezuxufivux.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f21b51aa61cce3092d89c077caa4130/mulejuxubewomos.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fekoxajavekidumi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/46392204619.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/jedufinonagix.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_off0001ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC9F 16664 bytes
SHA-256: 12e1f4ee68f84faf094a90ecc279932f8fe44de94564053c86282af99727875d
font_01_sfnt_off000217cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217CB 10656 bytes
SHA-256: 5c22503177e12adb63fd58f39d63168bb04e3bcac68b4580b84a0f45437e340c
font_02_sfnt_off00023067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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