Malicious PDF — malware analysis report

Static analysis result for SHA-256 053a342b53c41e62…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 19:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4fa29b1f370f6652ce5b4748bc858df SHA-1: 8536a7801d55ddafe54a00b6132647c61275b983 SHA-256: 053a342b53c41e62bdd038b490ad71db2205db0e06e752c8461775d5f0e39b70
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. This suggests the document's primary purpose is to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://arndt-fahrschule.de/userfiles/file/megot.pdf In PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pinemokajozefoj.pdfIn PDF document text
    • https://bunianco.com/other_files/File/konazisaxa.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/70573447200.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gnkcev68nsme4t38hmrkck7q80/suvimefofamibomabalukug.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/roxefaxawiruxifekagate.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050510125544.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/25628636448.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/36950591633.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/41931279407.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53c13a81e---60855684873.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddef09d66d---divumodetixelaxudul.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/vupenezo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b670119b---woluxudanodijov.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/82608659265.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210906092257.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nofaredarumadag.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/givipelasusizefikeguri.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/35085847496.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xerurofavadujag.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/wosowe.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/66880661483.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wejopi.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/zutadopitovisawejogituli.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/6526871905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=one+piece+stampede+full+hdPDF 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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 10788 bytes
SHA-256: d0c1066c7d6923ef3d2feeb00d4d2e9d79ea4926f3eda58e00122383a6358876
font_01_sfnt_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 15828 bytes
SHA-256: c812e1cd25452b58b08e022e1e34cdbdb9d72faead8f89fde1cefd5567cf7d76
font_02_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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