Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a190f7e30d2f1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55378f0fe753d93507b3b9b4f580cea1 SHA-1: f874991fc2933f9e1e43fcafcf356de08618323e SHA-256: c85a190f7e30d2f17e81ad3ab1748111b2bfb6f69b6e7736ac20513446a6d53a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one of the URLs further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://poulinstrapscan.com/userfiles/file/vuzawigudujuwisipumoj.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/jupipigipesenazarub.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/xidedupisexosuzekira.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bb7dc1d9ffdd0b81618b3b3c9240b0bc/48228802996.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/74517813515.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/26131738504.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb88568dc5---71848741343.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/3266339426.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/30723206550.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tojiresowasitafa.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/rilafugusejivuwo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gaxupazinopolomire.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/vevofukulitopo.pdfIn PDF document text
    • http://clarasonic.com/upload/file/warixawuvadad.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3461804---mubekadokanarodixupesefa.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/39112637330.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d187ac78c---satubapodiwikon.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/14229526700.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904150107961186.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc61631d95---10002841757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=transition+words+worksheet+grade+3PDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10792 bytes
SHA-256: dd18f5e42ac456ae7cf5da3607d0ada464cbb86475068e6ea2efd2e7172d08a0
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 17276 bytes
SHA-256: 1c49c8656d4696061a4d1eb66d606150c28dac7aada54d9f1982d2163c8312b7