Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b07b3dcf4c4eb79…

MALICIOUS

PDF

106.2 KB Created: 2021-06-29 22:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b23328b6823271174c618208e7f5fd65 SHA-1: 351c9c9e8d349e2f3c7ac9e603b2c49c1786d4eb SHA-256: 6b07b3dcf4c4eb79b4797310213251c1217f7fb299b758e67ef8d6373d44cdca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bd70ee2f---tawepajejabumupate.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072065b17b73---sasiliwilabirujis.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5431898094---muwom.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/68272774268.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086764917b0e---wetopij.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xubupibawolamafoxagu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rjgbe6nkl79eh53emi5i9g60h4/nojopewudapefowiros.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/rifimujeferodezakod.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/larofazedumif.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/35498449525.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/54b4f8d697fd7057a315fc3a2a2403fb/32815730937.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7a99e63e0c8fb3be6254357678c7835c/26607107194.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f42118ac6ef00dcb5170d9422282e2a8/74776158378.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160712f050aefb---75670989571.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29835b51bf76fd6fe508d519a21c8cf8/92648211719.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/57115876192.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/20fd8d0ff7d3768f1382dd22f7a2f2e9/97687767091.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c344be49e32---zowokimakokutamotejag.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25a1048108---70751162453.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160721066ba848---59291918811.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/46553654118bd5a87221c2c020f802bf/zumumonapezitufoxeg.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/177t0paffv604h6vb4cc9k0efv/zakagaguw.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/65649969149.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad33722553---tomatonozi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/984b8efaf675abf726138f768a0b7bff/64491873351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dylan+ryder+real+wife+storiesPDF 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_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15209 19236 bytes
SHA-256: 599b77f3747beafadcdcbfbc5785e9b19ae8041d8335d4f708cdc6ddf7a75b14
font_02_sfnt_off00018334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18334 10548 bytes
SHA-256: b419a5f00167cb4a43b4a2b8660bc5d07f7a019389eb1a6ced613da2e43dd8d3