Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a49139310ef1c8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 20:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6635853758e8a3a93e6b6517251e4321 SHA-1: cc3a0cef0f571f7529e742b0e0fbe6512580bd3f SHA-256: 53a49139310ef1c8b05cbc23355d12dbc1f6820f4178fbf01cfc76f55a20705d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to disposable domains or compromised CMS uploads, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://royalgroup.at/tmp/72045331256.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f75f247235c04df0df7034bde76c25d1/kamiluzubelolivedo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/werunokevaserikevasame.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/69635308088.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/45693243643.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/pesidujuwozudafozur.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/luziregada.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f9efaf3---zoworefa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97e0ab061---pasobam.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7665cff2e8097080d1f4e8a8072b7bc8/zenazenutumalopox.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/judukidekutokorunodajizo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f07bb67f---fanigewovariremodapun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcda48986---62000842285.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a561714fb1a---kaxatujagibuxul.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/21076831629.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/93446795195.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/pinujeruzete.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/74297136937.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/40276460830.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73408250923.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7db9612c8d73de2b7dff00973f1941e6/35042030060.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da57a7bfb68---tinam.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zufubojofofaxiletez.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/69397619754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+age+of+surveillance+capitalism+pdf+free+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/24157451962.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 11284 bytes
SHA-256: d83bae9b8677f856c69ae6a206a4b9e46155e451d9ce5d76b6b1915bf3aa55e7
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 18072 bytes
SHA-256: 934b8a6400faac5a1d1a3b32779c22de9edf619daa8dea8b096246250bda506a
font_02_sfnt_off00012c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1