Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabde820e750a282…

MALICIOUS

PDF

95.5 KB Created: 2021-09-03 03:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4fd8f2bd77c36002bee4c02f27fe3234 SHA-1: 6ad12ee57dd0962a8ec41c5b83c3403157b71185 SHA-256: dabde820e750a28298ec1f2856293448e0ba306a26b4a0101911f8eac813e902
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://ngor2-3.com/file_media/file_image/file/sajapebapazip.pdf In PDF document text
    • http://elfuklid.cz/foto/Image/file/zowavevopuk.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/dudivesugivopunanijaz.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/jumefatuguxejut.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sefagirugabixela.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/negubenagubujuwedutaze.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/lelenazezogirapozida.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd4bb7bee1977816d02c89ec3e05456/19716830.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/63295683352.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/65126264698.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/zuvitusurasu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac91d9870---lebimarodusa.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/49999579047.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5133866688---nobovuj.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/17030710190.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xugifugabigitixisupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7899b238a---1397895145.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/51244890612.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/74672890476.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/40663387027.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/fifosomaredexixevuwi.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/samise.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8deabdda3---30353520907.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/wovoj.pdfIn PDF document text
    • https://parfumzone.ro/files/file/boxidasu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vikukojoravevijufarorejo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lo43lvc1bjv1hju54c56ulh3pu/kixosijewudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=french+christmas+words+worksheetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10744 bytes
SHA-256: 2bc172123b0657d10784a3f66e8ce5b59c59f703367f3973bac11c712f95a526
font_01_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 19216 bytes
SHA-256: ae046b2ae36f815b6ed5a4fa9f01a32d8c3a9833e032010cd29fd999f6350267
font_02_sfnt_off000157e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1