Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb77be9deb85c28c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 15:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efc3f78a2f1ed902b7339fdaa1c374a2 SHA-1: fb7e8f2c72d126747a1a4cccfc1f0beda370f898 SHA-256: bb77be9deb85c28c3b376891a70165a54a4eb2d03ca6de4fc1dfc4ba5a4cd27c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://penmypoem.com/new/admin/uploadfiles/file/13851061951.pdf In PDF document text
    • https://paymentor.nl/uploads/file/75478374238.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/bowavodovoratil.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/duvidevawa.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/89408571001.pdfIn PDF document text
    • https://robertbah.si/files/file/77657907245.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/19547918677.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/jenusadafopovimur.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135992909266---xerafuju.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/fomirosijulotiguzefa.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/91865260794.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/fizudifobizonegikigowuxe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c316d13d28ac1603d5d7f1da0ead24fb/piveguv.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/bosilukevipoluza.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/164695305.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8f7b86bfe23a1c6a100f82cdf209be66/46669062287.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f936242b---19957723703.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/29193583971.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/podalotari.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/warominopapanizuvaz.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/genibo.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/vitovofomebawuvomopagaf.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9931c5b2c---zitijikowitesilebum.pdfIn PDF document text
    • http://guowangcable.com/d/files/81608270974.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2879763099.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/dumudiju.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/65499424314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=elevator+music+roblox+idPDF 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_off0000b72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72F 17184 bytes
SHA-256: 759f4803b30742b08e70f252c983f78b832ccab8d8370ad21aa65bc0319d47f0
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 10820 bytes
SHA-256: ac3903e59f6b5f06025330a261603addefcfef9285363d9ed924b7922712fbff
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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