Malicious PDF — malware analysis report

Static analysis result for SHA-256 049b6813ff4a76d8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 19:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e5add7b3689cf0729dea941562a41f SHA-1: 89cf9048e8b23f58bdd62960997bf1bb34df3d7c SHA-256: 049b6813ff4a76d8e4c3dd976f8dccb21356975fe8138f9f82837c8c2050349e
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 or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=memorandum+of+understanding+between+two+parties+for+business+pdf PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7b632830---40820079311.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/79885938175.pdfIn PDF document text
    • http://www.moyekolodin.com/files/pafav.pdfIn PDF document text
    • http://saaretravel.ee/images/file/bojez.pdfIn PDF document text
    • http://maxbrio.kr/files/files/jonadez.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/tosamasujewika.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/17337956321.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fufewasob.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/59474002726.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa83fe0d---xabujiminuberoz.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/48836428818.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/58252443411.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zuguzufufigabanewibe.pdfIn PDF document text
    • http://kyea.org/imageuploads/sugelepiwukizalofu.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/11899944984.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/57208668377.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/ruvakekegotemivebixesufud.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/demovoxikekatenaluvikepe.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/sevomafunij.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/59284539242.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a77cc731---62141256645.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64266369203.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9c92975---25208004149.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/66463868078.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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 16768 bytes
SHA-256: 9299aad7d0c99a66b26b44eb596b8005e2fff5de4bd4ef0e9d647fd685aad27c
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11112 bytes
SHA-256: 6dd3948c589dbc2fb9112744cf224cb7538a1ce53a38cc6d5086bc4a7f9074d6
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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