Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858233c3389f0aa…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 20:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 293dd9a8f6c763fc11d537728b9c432e SHA-1: fd2bb01e9602009603263ea74fd9dc3423d7a346 SHA-256: e858233c3389f0aa95242e67d79a521502badb79a1f0545ccf86fe205257976f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely to harvest credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=wow+leveling+enchantments PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/uu9fa960peinf9to98112gjmh0/kitawulolegezaxokib.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1793ef32---rugogalajunafatigusa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde441e5521---worerakuruxexogijamerelad.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/19375854278.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/91908705119.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2b2c5c8c---zinukipulesadaxesula.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1b5c81d786d2579e54ad8c7a8fb8320f/pawisigo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c389f4a6286---94856165912.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/29220198766.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/99047334283.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaad46626---33785968504.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0383de2002---gubexaf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3eea9854---27696914507.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k9s38u9t0bikidnj1r7afu7cl7/97959357046.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/dekukusizimo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2375685970---jizanixedimaza.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99794c1fae---84734999991.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/dunuro.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dssqrikifk4vansbpl9qjj4u03/18452847562.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608962a87de7a---tebakapaz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nsbg6rb3nberllbssn979jpmc6/nozowegowe.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44iog5vliplckmme9a3un90s0v/lodumofuzikakaz.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pjjlmc6idsfrrsrrh7rk2h8fj/77040616643.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/11843218873.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6ulirtsd5vb512f0vtmc0pvadd/wawuwifenunimajim.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/gepinugudeburobodanefebo.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 18304 bytes
SHA-256: b30830410bb0ca2cbc23f7f3d64ff85498a9ef90860fba4db6e2a14afba8a3dc
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 10720 bytes
SHA-256: e7220a49ca09fac018660b6f109fbed44c85220731ebb240457871c71a9321c7
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1