Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c71e3dfbb2602…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 13:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41bb95e29fc9109a023524c294672dbd SHA-1: 38f6eac7dfec28e0c4eb64c5b175d967be4d2902 SHA-256: 4c7c71e3dfbb2602f8e0c42c35eca7bcd674079320164a552753af513c48d84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/49685028107.pdf In PDF document text
    • https://webaprint.be/img/file/4131927987.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210914143527_j0g11s.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/59445816289.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615912c26696d---52582551159.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/wawevo.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/27699110681.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kubazanedupozejozedizosed.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/88035333444.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/59019114157.pdfIn PDF document text
    • http://cpviettin.com/upload/files/61365521207.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/17607474915.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3fbc71bae---bibinijijobibademivigosi.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/wexutimu.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/tasufibuvavemaduxav.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zijubavawuzekaxasaguvazes.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371a1ed6426---panezunilov.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4daa5a842ecab83cafa21948a10c8b29/98995146535.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/73592290539.pdfIn PDF document text
    • http://topflexsports.com/uploads/rogedodaza.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5f125662---67705578999.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/80015592333.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/10523876371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=themes+about+time+in+literaturePDF 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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 16628 bytes
SHA-256: 6673d49b2d94a9788eccc7743a0b81116579461390543e9cc9ec0b51db9b2620
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10576 bytes
SHA-256: c8fd2d197f3d9deec0a9a2abc53905018dc62839569d289f5af4e6832b8bce86