Malicious PDF — malware analysis report

Static analysis result for SHA-256 b520ddcfe077c7f2…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 18:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bee9180ccaa8b45875708c23f99d4423 SHA-1: 026597d1db41119d9be8c1621e049f5e33758418 SHA-256: b520ddcfe077c7f23f4e12d40efbc5ba320ce1a303d2276b4c52ceaa6c2317cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to other PDF files. While no scripts were directly extracted, the nature of link farms and compromised CMS uploads suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef57b8b24---lasele.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfd83b85b---menalemawemukadisimogax.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fd200968cbff9dd1b08208ea8eda0342/87048565341.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fu2s466548dmvbupdr7a1aagtc/depojivovuvefuboj.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d80b4fdbe86fee89496e5d21c27ff923/baramijorefexugugiloteji.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6e585b6a---xitutinadekirigada.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/texubudobugiwopozuvom.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/81412140762.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/90083beb32c827a110df603b516cd87e/37142991884.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a719593e52---kuvumuxu.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/tamatovivedurusefol.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/jofavodejevozajazot.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4499abe073---zopawatutemusemifabasa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070658fb6898---83509961582.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/36911256252.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/cc3bee5d92b92b47bac8c6e1233f7fd0/jutiperetabuxu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b546516a9---bufakotunifogub.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8346397576---medadigexanorulo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072621a25a0d---38809695558.pdfIn PDF document text
    • https://nicosiacaffe.it/file/67445861144.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/17248966164.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b544053a---24491818718.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04810fb42dbbdd6c401795c66d143620/nologanevoga.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8bb5fa95f569914caf9e0c52c1c61d89/35553816703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=state+of+mindPDF 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_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10276 bytes
SHA-256: 9c8321003f407482196908c82252653bd59a5205da87b095a891f863b729bb6f
font_02_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 17008 bytes
SHA-256: fda2486177e7ec4c4da21b75f1d5e278b339687ba8af43e8d3a87bb70a389e72

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