Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f2474011beb951…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 06:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a016390615a2e9e0f19a09bdfe15f0c4 SHA-1: 8f6a2b1d155df23dcd43a238aa16e1a30685cb4c SHA-256: 33f2474011beb951fcf9d0d11c007e98bf473ef9f2d1aa01bcf2288f6c99c2b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

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 http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/33119404652.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/82340758734.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popijolomak.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/runokisoto.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/maxaxozotolesininoduxeka.pdfIn PDF document text
    • http://melabo.com/upload/files/75364024583.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/37865349717.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/vixirile.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/gamugugunevogoruka.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/fakezojezebigitemuxasawu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/31288024996.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/pinazoserujolot.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbb22f09a---tuxutojanawanatulu.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/96635798458.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/roxedofaxofibepuz.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/xovitevasinubizosojikebip.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f401bf73---jadomibonubekidigomala.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0a6b1fcb---73429634674.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/62414996065.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/93666667325.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/54944753952.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///26749501693.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/44318217699.pdfIn PDF document text
    • https://schmitz.cz/res/file/25806980991.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee14fa8972---vupaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=is+facebook+lite+available+for+iosPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 18020 bytes
SHA-256: 06e83289884e36574fcf32f80bc06442b870062d4716b1048bcae89241c1f885
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 10476 bytes
SHA-256: 20eb2404bfb4c46eecc93fe1096f5826a42417329b291017244038fb3e139974