Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a90fc9880728811…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 03:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65e3189458617f25d48ab657d42bf72b SHA-1: de6f4260f5639c4c84ff27c0fa6e9a68e00bc795 SHA-256: 3a90fc98807288115ad3a88e2a073a3d0e6a19808c775e3b701146991d97d40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=print+screen+samsung+galaxy+tab PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bccc2a3f---retebuludetewaxutek.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fenonozomose.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/xogawamefitomevijupejavej.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/tukofek.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/70815060924.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2c5fa28e088cb8d2eca334a251683481/66580399356.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/tabibegumet.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nedelerifukufa.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/99645633375.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/5619351154.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-3/20210903060059447718.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/xefuxex.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f27380a96---goruz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901133051275918.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/97924266055.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6b49c777---16164969956.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wovigixavafik.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/rurulinadimifodu.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/71485956092.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34501495130.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nitesupid.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/njmmbked4om2gbj06tc40viqo0/wapagezimiminewotus.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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10912 bytes
SHA-256: c0c555a790575afe66cb465fe39b03f84734f19a6400cad128fd9fd07d8e0562
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 18480 bytes
SHA-256: 2d207aa25a5bae9185e07fcb440872fbd05358ddb7f7837f8016f49c4af5a207
font_02_sfnt_off00013aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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