Malicious PDF — malware analysis report

Static analysis result for SHA-256 01969eff237342ae…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 00:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a87839f756422bfdb0ba5458569b7a0 SHA-1: 679a9ef0a2adc100d4607d26a3ad04802121fbd7 SHA-256: 01969eff237342ae7d9875456575540deca5538528b52a6f07cf3f9bb91df5eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=phone+copy+app+android PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b4215288a1e76479d3ef322c6390d9d5/difegopukukesamesaxorewip.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/detegupovib.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/busakukafijulogeno.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/63753950014.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/19069794973.pdfIn PDF document text
    • http://salkim.com/userfiles/file/kalovifut.pdfIn PDF document text
    • http://poiskvod.ru/images/file/78565511646.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zanilurogikusatataluv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b150e5e23ffebf8a8caae86981ac8ee2/62045975320.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/korawokob.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/sineribar.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/58369617233.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jotugibowopefojelego.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319b8a5e2d5---tuvirarusafijulonak.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zaxujoxadebabijezexufimu.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/23160420430.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vepudisulipibozixudokajox.pdfIn PDF document text
    • https://matratva.in/userfiles/file/45090567074.pdfIn PDF document text
    • http://posuni.com/userfiles/file/notosibo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8be3dc6a---36921745332.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_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 10416 bytes
SHA-256: 70275984f06afea724263496a3ff63574cc6c3b054c0691e3de5b6429f834111
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 17844 bytes
SHA-256: 49b9e26c292ec0db462ef728b93051c9288d0927d8cc36c4731164901b42acad
font_02_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1