Malicious PDF — malware analysis report

Static analysis result for SHA-256 956eb488df95db83…

MALICIOUS

PDF

72.3 KB Created: 2021-09-08 07:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bd05a9a5f85308f20ac8fb7d78fa880 SHA-1: b5067b5fc4f4e5577881029da8c008b3993abfb5 SHA-256: 956eb488df95db8330bd59194b850470604ae83485f6477017ec48fd002e6e5d
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=poultry+house+designs+pdf PDF link annotation
    • http://fautographie.org/images/userfiles/files/niwok.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jufexinagezo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/69758781736.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/77225888568.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ef2d4a7a8---10416754988.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe436b0b3---kitigok.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b041f96371---58340368471.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082faa787466---gobatepufebewibadot.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/31441226339.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r29nig0hqu8jl5269rnil3cfr2/vamul.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/jizanabobudu.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/72660163798.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a2b43c30f---36010856831.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/253n6n9poatstn0thge28d6r2r/85497333185.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/q2arjov530q17p1165u07k0vv0/muxiwab.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/bofejevevok.pdfIn PDF document text
    • http://farashimirooz.com/files/pezetojizerunedagi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/16793298466.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/jenaralugi.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/pinogajamomelefoluwo.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/dukigagumibubuso.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gopabatimuba.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/wugavamom.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/26506953979.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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 16132 bytes
SHA-256: a501fba06937baa319bbb297bcbd1224e272fadabb6ed05f8a3059663853e515
font_01_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 10832 bytes
SHA-256: ab9ed8f811673e47f3ac11b19f82e4bd6705a274e63643eec895ed831bd94443
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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