Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1b0d6faa5eb7d1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 01:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f02680262c04acdd563d341dd3293746 SHA-1: 3f7b15f1c3968572abd63e5b3761a945c51617ed SHA-256: fb1b0d6faa5eb7d1e47d2acbcd5ef364cc00601478b7917d731ff2350cdb17ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on disposable domains, designed to trick users into downloading files or visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=remo+movie+download+hd+1080p PDF link annotation
    • http://ahrestygz.com/userfiles/files/20210901_052938.pdfIn PDF document text
    • https://majubesar.com/contents/files/41727752444.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/16202510014.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dipazegisarofipujedos.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/87799535254.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/lozipelubovejovadukema.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211141873499.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/28610286905.pdfIn PDF document text
    • http://rideco.hu/upload/file/8831589135.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/78588587875.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/86516967970.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02829d1b3---7282349577.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tekepawesa.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/62453842171.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/luzotesoxukazebajoxedipi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b9a5f346a9f76ddd555e175f6720389d/56353393824.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/lilinadisaxamokawu.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rabejogenanodorasebavamo.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82922627825.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/4989712223.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qg2lu9a019jh32dm0fhlmbp2qn/45144390217.pdfIn PDF document text
    • 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 17544 bytes
SHA-256: a4819c2963f5e8b1f25f85e7a4612748e4090180e0a618192001e713cd52509c
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 10872 bytes
SHA-256: 2b8272bbc3e34f2d779255c6514410cee3a8459f71836ab47323d5d3e9f53d34