Malicious PDF — malware analysis report

Static analysis result for SHA-256 45911975964505b5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 09:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8f0936cac11a6d1869a34a7d4728b43 SHA-1: 1d0cd151a1f8f52cdf1c1328f3933558eadf5b58 SHA-256: 45911975964505b58f8e4d34fb3a30f819517fa3f5c9f64b3b40199a380d266d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://proficlim.ru/public/userfiles/file/13778497385.pdf In PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/20518458005.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/potej.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/fulokosipixekimiviwupaw.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/kiratisavagewelugorufodik.pdfIn PDF document text
    • http://vce34.ru/attachments/file/lurapasedaporojuxel.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/pugapupu.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/vutuvawimumopevonijo.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/timeworobizujo.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/jofisoliwogurojupal.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/satagamakagoxo.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/bekelefudet.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd951bc86---61076866440.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/gikefitukejitofakej.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wujajugewugujiroxepi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/ravakuluwewetatix.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zedavumedi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143599bc11fc---bupufo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sfo1sfgm1eje5ujghfn7sobdjc/12643617995.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090611533478419.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e134a43f---bigusezunamedumujakipuk.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/85057881710.pdfIn PDF document text
    • http://aven.su/userfiles/file/49725244131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=boron+and+boulpaep+pdfPDF 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_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 10428 bytes
SHA-256: e584bb4613a00051d748ef2e4e093155ca1caba01f3ff318e8771d14273befcc
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 18048 bytes
SHA-256: 8f4bbe6ca6b5695ba913a915a4c94383003108f7562ef021bb3fa40448919a6f
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1