Malicious PDF — malware analysis report

Static analysis result for SHA-256 76136e6570904a8a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-18 08:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 847f035068e8f3558bfa992368ef7de5 SHA-1: 13f0e51947068163bbc5f24290be483b60243194 SHA-256: 76136e6570904a8a7c3de4970eefd09758517c164434f2c9dc906b217e6de0ae
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to external resources, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf97d6ca8---jitulawojaxaxowamo.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d1567f73d32a572298120574bdcce4c6/68542233050.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f728b0b2a---gugepozezajabinuk.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fabaxamora.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e716f8117d---paxadurivap.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xemadesuvaleda.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/kuvabege.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/mifiworelomuripuzada.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/jexezegufazujibog.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160889fc8d5634---90043707342.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b95265033---wogolowewadiwu.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/15212835548.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2ol7v8m99emj1fgh4keiedgqqf/342433923.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/40526929337.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/vubud.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gupozediko.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e15c4d60d7d---87895384961.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/73709954832.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c948f4c9686---kaxopubetuwomuwevuvo.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/70134310779.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/14496157064.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r2p3vlihd3090eg86h1htam560/36927578138.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721eb7bee9a---36494750646.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cc75b40d---52498825986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+omega+red+romPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10280 bytes
SHA-256: d36988d989a986e7f24d499aeebaab76353b78cae909f327882c9bc5f21d6211
font_02_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 16252 bytes
SHA-256: 77561df484a3c970b0dab0f2acb9ab4109256d41a4502e6f240b7c4754761317
font_03_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 19388 bytes
SHA-256: c3ede2c56ba4518caaf5a6e2811bfbeec33684b40c526b035261bfdfb2dbc015

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