Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bd2bcca52903e1…

MALICIOUS

PDF

138.5 KB Created: 2021-05-26 02:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8091b9822af96db4b1ed0b66fe463874 SHA-1: e30580a8f7a591fa05a2a14ac4f1d3fe83312e06 SHA-256: 02bd2bcca52903e1688b3930957e26386160a278c9288b326a53570767579e4a
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 pointing to compromised CMS upload storage, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while some are marked benign, others point to unknown or potentially compromised domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160814e8cec927---wazulokakijulazulolunaf.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085234ca48ef---15836361760.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d197d3657d---56892139538.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0370c18f5---96912830315.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e06b453f8---2849472311.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/220c4a9ca7a7cb565b4b1b9366a618bd/pogigezuvixabikopivo.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608627502c219---lolevererojalep.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fc8899c716a625816cc2710eb4ea96bf/dediga.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c982e5807cb7eb006052cec9c3930ffa/70003707278.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/041a99b4085eb99c105c43c64f9dbe91/zibowixesif.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/36c5f366fc31f9c008e58eb4a65aa028/9310094591.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gomcdfb12299ri0oqihj3u8pg5/53387644180.pdf
    • https://alakharia.com/public_html/userfiles/file/18308600159.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087490cf1544---gerexisufikigosurazir.pdf
    • http://notarbrazda.cz/userfiles/file/83952933646.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a460fe6bc40---2319750866.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=winkawaks+no+detecta+roms+neo+geo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb0.bin
19ff9f7f46c304f94960d86493e3c2cebc2d64a2d8302603f698d0f941e183e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 78608 bytes
font_01_sfnt_off0001c938.bin
da7acb3c0a40ce6c0cab8f0dff39efd474894675bf42b46cc877b1eb52f194c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C938 5396 bytes
font_02_sfnt_off0001db99.bin
4a2c8834479ac179f7a041aba2ca62cbbb8d3246c8964cf6e80e62ec13d4a7af
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB99 12460 bytes
font_03_sfnt_off00020429.bin
eb29371a9263d1efed02b1533fb53138ee823a98fbd078e52407dfdd24d7a728
pdf-font-stream PDF embedded font (sfnt) at offset 0x20429 16192 bytes