Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b97a91d12dae1…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 21:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3317ab2affa4b491d70d2111ff4cfb3d SHA-1: 2f5ce6e516c6237e42d0317001a1473591838574 SHA-256: bc5b97a91d12dae133b09f1762841b0c697bd73a636fe1d4745e7bc9cddad467
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple compromised hosting links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b0907bea---27263440067.pdf In PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/14096128235.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092523593f34---60883223541.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/69522971629.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c51ad1121ce8d153ecfe49fee9c8ae21/xibiluzovij.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vawesox.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d809b7e---38312733318.pdfIn PDF document text
    • http://cjatkinson.com/userimages/85734530364.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606febf927b4d---49758498798.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3b7d7bbc0a35a8a5b170ab97cee3238c/fabulebosisimiguz.pdfIn PDF document text
    • https://tonitomov.com/picture/file/pibotexalutugipujo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8f39e319e23c218ed5c7bbb99f3a18df/sidoninivodadoxo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0e41bec5---suvikugita.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071825bc8249---wogenugixodomuzaximoxo.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/39317930128.pdfIn PDF document text
    • https://noddy.nu/images/file/zowape.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/28194557556.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/35630644594.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bezirigatadimubewutomuse.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c94cb03f7ee09e3f8bcc6bb15256e58d/90301859138.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747aec9c411---nimeridizawawe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/322ed0eae69e27c8ffb6196afe2f686c/jomapogar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unblock+all+video+proxyPDF 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 17596 bytes
SHA-256: 358e8607dc32540e4038237c8457b81786295ba3b6008e5599eb701edf235f46
font_02_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 10764 bytes
SHA-256: f2f43fafb18fd7934b2a96b8504711dcf45e432c93e34638a7452d8b7dd6d7ee

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