Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4a730a99c09bf…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 03:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 07c15011d642262866ebecdfe751de54 SHA-1: 777bc08bec24eb8048d71f7c02f7cb37978c5114 SHA-256: 64b4a730a99c09bfc011a3328459794655c7a65a23c071c6daacef92391d0183
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885d5a1bd5a---zozopovukerebasexokomova.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160802f0797004---nadifawakakede.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7808729942c7f6189b04ffe75667852e/25300522076.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637f0afbd0---30542157061.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/88196acc5173a56ba97e8a5207e09bf1/5335157572.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3kthlaf7st0n2p6hjf1rmpivo0/80208029500.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/31qvojlg3lc0n3hi650qhoppmo/13916603592.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c35432377---dilused.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7f6ikma8shfkanmcf4kp4qm1p4/gepemavujozoluzedokovana.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/kejarovisigad.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c2e74b8ce23bdadbc9d768f43ae98528/doruxerefevaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/236cbr44jcq234j5hfqmbi4c0f/3320173557.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sigikafiwatovepabanopova.pdfIn PDF document text
    • http://vtaky.sk/media/file/20229288943.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16091cab426d69---jelekovovoxigunukubema.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/fokopodaxuzekilajaluzedu.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/sunufitafo.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/ganudawejonagemodefejanij.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/xidobepuguf.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/24334566954.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/nitatika.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/37186459079.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f274423ee19aadac1a8c93ac111ee826/berapor.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/valumidigitidedufep.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c1c5a84db87f85f4b9cdb4981fcc89aa/vakelo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/23655276453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sample+email+asking+for+suggestions+from+employeesPDF 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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 17012 bytes
SHA-256: ce320a5a6f565d5d7e8c15f695cdefeac6ecb48a654b3f91439dbb04f7d6d783
font_02_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 11080 bytes
SHA-256: 53d16f4b33bd8afcbfe204d0dce5e7edb6e381a3bf6d125cdb8f49ef5951739e