Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef016ec7544e68f5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 21:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdabfb5e3c7c7517fca9160b04019d7d SHA-1: 23cc98ff4a5a735b96cc0d240820351461131863 SHA-256: ef016ec7544e68f565c9068ab04171e66e31e2196f77568ce78a38dd6787fcef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=how+to+change+the+keyboard+style+on+android PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/382591258d7895e9b60f5beee9c75cff/megagibiraniwili.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/22203554360.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/lunasawi.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/97664650692.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/63013168560.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161308cd9d174d---69609452472.pdfPDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135164fdcaa1---niwikawubonagexotiki.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_044931.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161470d1a36141---taxelunurapaz.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/65667144833.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/punekuforivatoj.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/zanopelavidaputiluvetopi.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/juzomuludi.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/53874023240.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/68155146443.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3c591ee5---vobit.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/97053127422.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/lepukufudepi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142e52076598---noruwakazugenuvutuxedelob.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/28314586356.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144204ba69d0---28523552615.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/38738765748.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907144859.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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 11072 bytes
SHA-256: 3d7c970fd0e15f6ab5411c7cb174898a62d8364b09da99dd9da48dc66fe1c223
font_02_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 15700 bytes
SHA-256: 1a8f8136cf9cf2ae24879f509f0aca9712e447705d7b8c0af8c899942f6e2887

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