Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcb9008b33fe58e…

MALICIOUS

PDF

107.3 KB Created: 2021-06-26 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff37969bb5c4695aff66152fed1427fa SHA-1: f8e5f11926b8587a1b1743d94608f4dd5949930a SHA-256: 0bcb9008b33fe58e4a017f76f9cb1fecf7ff2f7bc7dc132c29c5ce4c1a394b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=sony+bdp+s580+manual PDF link annotation
    • http://jngf.cn/files/file/webub.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6b11c24---99879900115.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/39358298fa24b00b32c25087d7a469ac/vaxifefozafezepoligimuz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcfd68fbc99346cae41c30b4622c02f7/37237165328.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/51034696958.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/poxizefoner.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/e1d25f52e3df9621dfe5fc3fcb8a8c36/xitalugexusezonajuxejuz.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/11237744132.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/045dd49628d54785d0dd76873537b163/xiwiso.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mowofasot.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210609075143689475cyp5wu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1b537de72b0dd3ca939f8c7b81b4afd2/gureboman.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb413da8e---bumemo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8ca7a628---18329492687.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3a6e8297cd6ae443a8b21e99e10d61e8/13929792834.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d648357b2c6---16744210631.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/54255862412.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bomasarojajopina.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fik0t5o91uhd7mbnan7gntm402/6230276107.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/73855206794.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052705135073499.pdfIn PDF document text
    • https://7gking.tw/upload/files/48652872822.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/90880159715.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/53545ed232a1ce5d56fea13d7fe5fb5e/58767413484.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6e56302---10377239875.pdfIn PDF document text
    • http://dnepropress.net/files/file/jetarejagavonazomefep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 11024 bytes
SHA-256: f1e605835c82ced671e42c191a626d4a5822c1e8e4e708c07d13aef2e6984c4c
font_01_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 18668 bytes
SHA-256: 320fdaf3ad5c470e3c280151bdc6a02186cbed530a3f1406e15de5d43f2bcd90
font_02_sfnt_off0001614c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001795a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795A 11952 bytes
SHA-256: 41a3aea5f1a04ab8947a766566a4733a548a7ab1a69a8636db70122bf903d453

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