Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd2ea5d3b4cb13c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 15:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f81d3b06359f58641d689650714740d2 SHA-1: 9f87b32a1589f09c5242aa16b0fb0ea32041cfdd SHA-256: ebd2ea5d3b4cb13c478db7a31535ed8badcf0a3b5739a42140e673079881b059
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=norfolk+southern+rail+map+pdf PDF link annotation
    • https://byocamacho.com/ckfinder/userfiles/files/22314398637.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nilimoz.pdfIn PDF document text
    • http://teraval.cz/res/file/jaminopotoxanumobe.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dad28574---17362993462.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/jitazol.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jofavisexosegom.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/18262755424.pdfIn PDF document text
    • http://rilta.net/userfiles/files/vasogefolek.pdfIn PDF document text
    • https://puppometalli.eu/file/femosojoxulejapam.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/60438026587.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/10183568342.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba22662492---vifizuxabavejiv.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb57787d08---94557221120.pdfIn PDF document text
    • http://cke.hk/userfiles/8620953178.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/jetomidedej.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/31979458738.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/79489906400.pdfIn PDF document text
    • http://cartopack.com/Images/file/90433678521.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/14406568943.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612d8f4e8a2b4---37267181227.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lufefizanoporamiw.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/25318341422.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fg9dl42h5l130tpkn4e9duav05/lapuxesafed.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/62517279043.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128add2a97cc---22598856494.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5d0qei6jsde8clodamubb7cafr/73513679388.pdfIn PDF document text
    • http://congluc.com/upload/files/18681700948.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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10932 bytes
SHA-256: f4a9c25efd981d9ca455d73f5481fa6f9a206c695326711d20910edc4fe45e92
font_02_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 18372 bytes
SHA-256: a4c1d7f764404916e67db8ccc7890032912de913a48f3fc557ab7059681d8a1e

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