Malicious PDF — malware analysis report

Static analysis result for SHA-256 3343bc897e3166c1…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 21:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f10b737230e973c5d5afdf564da45c73 SHA-1: e7f2a99141dc44522768a433bea8c9ea1e36da94 SHA-256: 3343bc897e3166c11bb577c879f0349fe6e8aa48d04818a48dda3e6582af34d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3370b727---wizobin.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6rl9b3plbohuemtq820dnsr6dg/72148904206.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869149b9e0e---fizizavakumasulabuxopu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/89290443395.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/48d76e2689f295fbdae22b28c70a0ac6/pulukaxutev.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ornvqcusv2b3rjg36tk64vqugs/vukazopatokema.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/75ee8f572188a6137223522522f34a69/goluborimapitu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcf5f6aa---vanufapezazemidoviniwe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddabb95c030a3253a9e7820ac7df0f3f/70230390189.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b784114e0---53946485703.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7674b9fea---43351649491.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kosuxuranafunewolurot.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c16b1dc4e---jobomavolikefenobujasifa.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/75ropkekbsdu02tt2pmj283uj2/jetevujirekudaxivon.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4b08c7f---17167972930.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/nijumesujugeb.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1tkcg0jeg6u9427icoqcn5j5q0/negino.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6gf07l1b6unqsgak0dig531a24/53485558180.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d08e2217a28978240ab47e6fb16bfa46/95746043873.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3cf3a4c4---40685679695.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/7588533177.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xazagifolopezi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lrme40l7an57lm82cbcbjjuhs6/fuzuterasakegejugosuxaj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8b329e38---nebatupudidoba.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/89698655309.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/40140288890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=average+cost+of+spaying+a+dogPDF 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_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 17464 bytes
SHA-256: 20f8ffc8c65dc61506b92bf177fca61019e1a0cb9b5fa699edca1b81e2c5b2cf
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 10912 bytes
SHA-256: 0b19a51914bcb27c318ed4e1ddba18cb7e8f196105c477783abeef79f697343e