Malicious PDF — malware analysis report

Static analysis result for SHA-256 646f1af66f81ba84…

MALICIOUS

PDF

88.6 KB Created: 2021-07-04 11:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1fcec7db4648c36c493f1722a754dcfc SHA-1: 4e4efed21b8157f7581a9b6302238b01333694fc SHA-256: 646f1af66f81ba846a577a0c4c45d42f05ec8a8c9b9464293f68bf33c92fd19c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=leo+dicaprio+great+gatsby PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rk9dp9gs3aum91qnthomlnjbn2/supon.pdfIn PDF document text
    • http://learningkey.org/userfiles/pivetibaxepanizago.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/zaduw.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160787f3cc33bb---xevofas.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd447dd17---82746877768.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3a6db5022b9f6f6122891ce7ea4acab/gujimuxi.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/rofopuxuvifiriladurud.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/674daf966d6bb01d39bed797bfea81ab/gezimokipuvevow.pdfIn PDF document text
    • https://bdata.vn/upload/files/13333940504.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3029293a05---65448639318.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ac0e3d6f2d38fd532467d2325747ed0/52027228009.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/31668142071.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb22f0bfc---kovisizokulave.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9854c691315617f0952d00c9788d5422/89180267996.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/jejodusejiwogeno.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/jirifedepojujowobevabemil.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7df79e9c19514242bc7c8c6c074d5255/29790633452.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f72b3b5e0---wifatorufisevotaripunulim.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kofijatoxezewibefideseto.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/nawuvorigiludaj.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/59aec2e3b1008599a9aeee82bbe341fd/pimuvibodaxekajikomumuti.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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 18016 bytes
SHA-256: fd7fa529641dff06e6beb02dff69eeb47e53de8a2e8f4870f6284da6e3be447c
font_01_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B59 10752 bytes
SHA-256: 5a5cfd53bda2800f4353c113b9cf6ab12972153220cbc5e43012d143aafc2db4