Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2fb5b4f38202dc…

MALICIOUS

PDF

84.5 KB Created: 2021-08-29 09:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f611189a649002dc65d2fc0c0b14a3d SHA-1: d6de5d89a513e2ad64fb914b15e7a8e4cbf3f7cb SHA-256: 7f2fb5b4f38202dc66f0928a88c997f8d9b81a8a1fee029ec857fb35e6c2ad08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the presence of external URIs and link farms points to a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=both+of+us+idealism+piano+sheet+music PDF link annotation
    • http://ajisushionline.com/uploads/files/24722060088.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/44309500993.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075886b342f8---41644123675.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/89658012226.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d1c0e9e6b---bapevufugobedarosig.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/22415741408.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/makijebufixixizawobikifo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/batekuzi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/10151488484.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/sufonuxodowa.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/596456359.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/12273663076.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160971c1d02794---xorulivof.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210605015604.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gakuso.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62db41a39---41298193385.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kpsk28ia08rciihunf3nbbt3mi/52947390621.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1eebb779---56450081964.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/96743510563.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210716162639995269.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a67cd3c6---46340345905.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/lujotizexudojapu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/09034ae3b5403e1551a7772ce5800e64/70220359525.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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10940 bytes
SHA-256: 49273a34bbd0ebd4393dc4ca9e39be7b5644bc4a6c45aaec71c237829f22e593
font_01_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 17856 bytes
SHA-256: 4cfe6bab97c8c595bd5900fd4924e7d769642ecac179f775eb08b69a0759a8cb