Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f22ad47c6c234c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 16:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2f01a4900265e2d61780f5e6c29d09a SHA-1: 4c303ef596d74506bc3c63a400fccefa7faed5af SHA-256: 39f22ad47c6c234c75633aa1cdd3ab37b4518db223322626ac41df0fb21d9525
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huuphongplastic.vn/uploads/images/files/37590851261.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/latujejaw.pdfIn PDF document text
    • https://mkontroll.hu/File/95651564538.pdfIn PDF document text
    • http://dd-eng.com/files/files/41844491345.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e5ba644a---15952953265.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/dorisonajejekaguwedonineb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac8d6ed48---wegotivijitijoweb.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/tozewazabepomuluv.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/64929107932.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/vibataromidukan.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/5581831755.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090114040673499.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kujawixukozopofudo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/nomifariri.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/verupud.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/38727928710.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/moduvoguduxud.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0f5229b4---80915640707.pdfIn PDF document text
    • https://pokereshop.cz/data/file/towenixodotagepajegow.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/77288596371.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352df2d8c57---jukesadipapujuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=poultry+hatchery+project+report+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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 18164 bytes
SHA-256: bdac6aacb937a9348b4cbae6d7124b489bead98f852788fc9733e6df85341de0
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 10696 bytes
SHA-256: 2d95075371b3873826c2cee3ea35f0e313f0e49a2ff1dc624d970bb687a2b833

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