Malicious PDF — malware analysis report

Static analysis result for SHA-256 82745f4d0311336a…

MALICIOUS

PDF

101.4 KB Created: 2021-07-18 17:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1c5c6e6caef5d056edef79839accaa9 SHA-1: cc4aab42061e46c59cbf2b577517ef3e969bd737 SHA-256: 82745f4d0311336aa67717083fbaf2c0edc6e3ac8a18d81dc3f1f22175c0238c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://galluccifaibano.com/userfiles/file/xusezegaxonojuvora.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4c842c4aa9eb2b2a7c06ab026449f19c/ganugoke.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h59jvporrj4ita2uopogctrfim/82683342361.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3019dc77753b848029139b659a0afa8b/82624880889.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fjc3ejrkdqgng2bm3arsitclbg/49781220555.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd045d5de---96388206002.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4cafcdf66d44a9a5c35a395917cb182c/96052632134.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/rikukasomukateju.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3djtqdqbeuvuhjqdf2nm6879l/kapesaberozajekoferar.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e8bd0e63---96908126068.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a1968cd3---poduzorebuwaxakud.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b463a80896104e072e91867e38a9a0e8/80852445555.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca5b3715f---58833950379.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077b167aa6e6---50528106059.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9478c30e---62167113217.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/75510026961.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7e6f51a80ec9d15bffd200847679c3d5/jolaj.pdfIn PDF document text
    • http://candientuvibra.com/images/file/poketejememifaka.pdfIn PDF document text
    • http://pololanna.com/user_img/files/32227341814.pdfIn PDF document text
    • http://ubest.ru/images/file/vibezi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210621204816.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/keravuritujufatuda.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c621896990f---gevazarezemapu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/suluwokilumidinusajati.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160793079d91a0---neridisovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=would+be+therePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10052 bytes
SHA-256: c0a0f2966e5b45b1524a450e8734528fa2945f68935d35b3e166d3c89e3cf955
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 17572 bytes
SHA-256: b5b9cf8969c5e801257b0886219bf936f23a1845905164ab67c2b00c9fbef787
font_02_sfnt_off00013bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 20620 bytes
SHA-256: 707271e895a45432b1727a91b41824696f4a80877210e9e239feab613f2382b3
font_03_sfnt_off00016eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1