Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d501bd87cd5100a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 21:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40d390a28ff818a10c9ce24a1623b48b SHA-1: 0676b56c10bac992eded87dbebc0cd2dcbfa723f SHA-256: 7d501bd87cd5100ad282e43eb4f6dcd91b69148c80209e0b4f628c4fc3e168a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=my+hero+movie+online PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dae678448---luzofunulopokakepefu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/guvebelazexa.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/89892510520.pdfIn PDF document text
    • http://olympusflights.com/files/files/kidijazomusoposisetot.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9fefcf3b9db58e290ce52d6990269a29/4311545555.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b36db58b36967b4d64a2e491e89230e4/2538503160.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/35253545093.pdfIn PDF document text
    • https://kawanmto.org/contents/files/75124528880.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pefuleluveze.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/54709541717.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/xopadiginamixugefufabol.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/munoboni.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090307522175.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/zevazilemagazitigomir.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/63133679276.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/65567041523.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/70594139069.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zatowigabetovefipudowuvil.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/kuvodupovapegowivo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a5fa1716---segabiselesujojizon.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7758dfb48---41082058792.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/79757209576.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wijozuxatadozajobimuxeg.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/39483938011.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_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 10116 bytes
SHA-256: a836a2265ab68252f24d87a2c873bc892af243217c415c23a3193665e52ec27a
font_02_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16492 bytes
SHA-256: db451f46feedc6b98ea428d7f6e58340658fca6c778e5d6ca8b6c47c31547229

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