Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc9d1b65acb1286…

MALICIOUS

PDF

113.4 KB Created: 2021-06-24 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5439ea603205d1def070b16e0a053bc3 SHA-1: 741696e5a786da253fff1c1bed3c7fbe50fe593f SHA-256: bcc9d1b65acb12864d05dba9dd7a86eed6d0aa2eb17426d254ee91d223dc67f5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://reanda.com/jingkelun/userfiles/files/20210604191827.pdf In PDF document text
    • http://buildinggodskingdom.com/webcms/file/manaw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a024bb30035---41740294009.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/63043cb9149a5529219439836a9a0547/wubow.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/961193c0ac9f8b1b29e317ed307c9a0f/2586610720.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/nafojegumegupaviporak.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sifilolimalosanubawefizak.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/24715489812.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb8f87fa1---baputaluvolej.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/3971495831.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hobo5096odcmqbmg4a7q57a8as/jusuwesixu.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/6672548614.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff4d69a2d---2883264530.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511061025.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cd5pj86slmki6ub4jfcqpablsu/79020482155.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bba52839---69838817376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comprendre+toute+la+finance+pdfPDF 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://scripts.sil.org/OFLIn 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_off000164db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DB 5028 bytes
SHA-256: a6c3391f627ab2439716c4d339f43803b1be7bc1fe55f37d0a6f169ffd78822e
font_01_sfnt_off000175dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DD 13580 bytes
SHA-256: af1587eeaef8e342a8324a1f233470aed9137e60b2eb18c1326ec4e470434325
font_02_sfnt_off0001a0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0E9 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e