Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b3a8183b375f84…

MALICIOUS

PDF

87.3 KB Created: 2021-08-28 19:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b7e18fbe8314ff6714098557dda0c4c SHA-1: a6a27d3e43ce61e4521288f2f917242c10c03e0c SHA-256: 34b3a8183b375f84293bfa34f09533117fd2790508706aef93606549e41ac0fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=benefits+of+jogging+5+km+daily PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb026c196a---jepaf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d6c7dffd75bf3c3d1228472b64cecbb3/67255270560.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/zekemowovixu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/89532580915.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/siwegosokomeg.pdfIn PDF document text
    • http://mosjob.ru/images/file/37768420104.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4o7m28h527s6eikc6sd376lke7/15296966196.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15162e18a---zerofudate.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a1600c63f3b51fbcf7185dc1dac0992/83316834399.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39a889f3---82788525080.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zabixazowefexafamuve.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/kawalowutisidifupisu.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/lisamosilakuretifosax.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/weralimikazegujowabo.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/negunomebibaropemam.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/57827751366.pdfIn PDF document text
    • https://coil.hk/upload/files/27236786112.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/84113368079.pdfIn PDF document text
    • https://memoservicesrl.it/file/69653168247.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/15463618141.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/ruzirosamarizirasamakusab.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2869dc2705a26d96301b7d8e7f5e676c/81976533857.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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 17504 bytes
SHA-256: e6e8263a535fc2687d9fa251f9278a71e9ece94a532724b913893d82c107d81e
font_01_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 11120 bytes
SHA-256: a845592a80d7df5dc2196827bac103847b6b890e9681ed64305319a56c89e588
font_02_sfnt_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1