Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb60c987c190318…

MALICIOUS

PDF

94.6 KB Created: 2021-09-13 21:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2771789bdad02bad08c5af4339a34109 SHA-1: ae1bffb2b31d759d93817af93f33401f8857ebd1 SHA-256: cbb60c987c190318954bda3b2086fe528a02e964e6c9151754337e2c490491b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or acting as link farms, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's likely used as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=hd+bollywood+movie+online+watch+dvd+print PDF link annotation
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/4633293826.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48336360459.pdfIn PDF document text
    • http://viorina-deko.com/images/file/dijejareluxarasare.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a152c2f0dc---63155253045.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66c20ea54---soremu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/meximaletikegudemeloz.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/nujukorekujubapasoje.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/83131795008.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/44132643893.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/62995798122.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/digun.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/rimafifuzusezevokeg.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/remanaro.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7c2f3643c82a42d1ada86962d7473478/6559845960.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/wobilovisevevipojizojite.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bopajapo.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/xereliwewijul.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a2c8187f7675f9fdf58c9eb7a6280857/gomesajizevab.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4dbbedab---5007399598.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/63291571392.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/15306292674.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/puviluledapujatososomunol.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/ramiwemirasifixemetude.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/81224018600.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_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 19312 bytes
SHA-256: dbc9a9f606e92a31412e2a45c57f784eb00b34a5ad177eadcd0f5dd32ed1fcc6
font_01_sfnt_off00013b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 11008 bytes
SHA-256: 144384350fae5df7f5f6402071d00f5c090f788fee48cb06e160a79713e1a0cd
font_02_sfnt_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1