Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e18bb8f4edf2135…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 15:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 037c4d8fcde8437a782d923e5ab9bbdb SHA-1: 634d9c0bdad352bfd8f88e3c924daf0a13e739e5 SHA-256: 9e18bb8f4edf213593ececc4c8426a0e7652592f09ff7d11ca5eb036868a2270
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://handientu.vn/userfiles/file/wotinegonepokofavukeni.pdf In PDF document text
    • http://a-aqua.fr/ressource/site-image/files/42162268401.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/80868775455.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb7347cf2---80969125145.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/dowar.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/radebupagijotipuxeni.pdfIn PDF document text
    • http://cudicio.it/images/file/49180035281.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3eim8e3a5vfsulqpckuqnbhlfp/92151060498.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080f51fee70e---xopukaxosepitizafanorig.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b191692b48b6050a51cb1b8430b84633/kimuramebulilozotasuf.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/31449044014.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kifuwibujufebuxixegojiju.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47518af53---bexunovavobuborixatif.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/pixokuxafer.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3625b5b92a082c13169d39f435105d19/6739493485.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/4302722751.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c166a37bf---fujejibubumamal.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/57783367038.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/ximurelunovuwipaz.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/96338514496.pdfIn PDF document text
    • http://adveotec.com/img/file/juvakoluz.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/bopevakidumegamozikowigof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=resize+pdf+in+adobe+pro+dcPDF 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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 17864 bytes
SHA-256: 66e400a16e99583d8d1d38ad4323c489215d4e9be978e0ab3ce141c891d7f2d8
font_01_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 10716 bytes
SHA-256: 930aea2005a311de73ef9bc506052afd59982bde50028ddaa6f8094a11404676

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