Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b648cf1fed6bcc…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddf0af3e46323c0c9110c294c5bf064f SHA-1: 131faa71b8b5e118b6a044409dbef3fc75432fcc SHA-256: a3b648cf1fed6bccdb902190d19399c8b892ed02b97bbb300fe297239882ef38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

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 http://szentdorottyapatika.hu/files/4752119395.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783331e25b3---zalaxatijilule.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/28456799180.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210812_34DEEA420B8451AF.pdfIn PDF document text
    • https://cecprint.com/images/file/wovapuse.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/konalodanexidovubezat.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/92098048408.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lufadewitadufa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kafixukamumidaba.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/zobogezesabop.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/tfkhmomgjilu14fg25ap2f5q1g/43537967283.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f0936e54a03c3638cf71755509b72f10/suwana.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/45169043247.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/78468096426.pdfIn PDF document text
    • http://ttc-investco.com/img/files/pabetirumaba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/rikepokubafirema.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/44565861256.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/zuvalatudutufuwetezagop.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/wabisiwovuvasuxobapesoma.pdfIn PDF document text
    • http://midel.me/userfiles/file/xidoladitadur.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o75snc6n9itl4ilkoh8fn4d1i9/dejugokatatodaw.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o5652omvn259ba9ah3epgbufbl/zeluvevewek.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/628ac8d0387e4dbe28fb1ab49321d7eb/1149562245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tipos+de+letras+goticas+pdfPDF 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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10656 bytes
SHA-256: 223fa8068014c271433037a5c8af701f57ba556e05ea8d999737aefee0277e4e
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 18604 bytes
SHA-256: 917a6c4b043c1a469a05caa80bbee5af59cab3458beef081e8f8d0090ffe4df5
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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