Malicious PDF — malware analysis report

Static analysis result for SHA-256 d352a30b458250ca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff8e6fd8157f622e4e49312ce68cf31d SHA-1: 7f5c7ccc68950439cabcbd4a03a37a4812b423f3 SHA-256: d352a30b458250ca6afd17e03e634934a30c009c43cb7ab9c98246c0fa45ecc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/12932321910.pdf In PDF document text
    • http://propertiesforrent.com/userfiles/file///37291454781.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43f87d23---vejigumubumadigufu.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/gedupinan.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fitok.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/pozikofawupesusog.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/11666447410.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fufeleposopi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/sutozupogaxinosana.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/22720999745.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/94328262037.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850042f1d3---22357053972.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/penaliwididodifelejis.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///69536348915.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/51481393535.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/80834577510.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mubujezoxesefirukesig.pdfIn PDF document text
    • http://mp-journal.com/media/file/diralilavol.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/45910738337.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/8020846282.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/kolob.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/14527794878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=moto+one+vision+updatePDF 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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 10400 bytes
SHA-256: de1a88d6d5901d392d6e4ebc50d2a4e77f3c0421c3ddf4af8fc9e1932bdfb405
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 17556 bytes
SHA-256: 4006fae51a047d57ed2d549931b31c3723333759123625c47554cb3658027fe9
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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