Malicious PDF — malware analysis report

Static analysis result for SHA-256 803f631cb447d054…

MALICIOUS

PDF

82.6 KB Created: 2021-08-22 02:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5a83c428da03fc63cf5f6b4b259cfc0 SHA-1: 234887b221174aa88548eacf73e6e251d51b253d SHA-256: 803f631cb447d054c6ffcf73b31d75641e9063f0504e295d1519a30385dc383c
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 compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aronabritcan.com/userfiles/file/51436475136.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ce2ded52---saworamekegafavedux.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/8458222206.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/29f1g8p9rhmcs9tup86m0h1ii0/47586685804.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/koparilame.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7ee2c231---8210355684.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f91bf1f2e---vifowowunoforiwur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182ae365600---30759466330.pdfIn PDF document text
    • http://stl-hk.net/userfiles/32832646915.pdfIn PDF document text
    • http://dentali.cz/files/files/zagujewowilifed.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/92011243474.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e848753a3---sijugigipomexevit.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/9565737416.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/38116605552.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081756eccd4f---robazapupuxubumutu.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/jalolowebakelumuwex.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210805070458.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c27157ddb---fojudorakufijeketowizarad.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/biwonaginikun.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/norasesij.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/93821973332.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d5e492---44116372537.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/tabuvuvozasowapadobu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a07c50b1---60911638251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ingilizce+%C3%B6%C4%9Frenme+kitab%C4%B1+pdf+indirPDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 11412 bytes
SHA-256: 6e965acd63d7f5c1efd1f9a601958c538eb8e7a84c4c42f88f86d8a2f680ab31
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 19332 bytes
SHA-256: f6eae130e1b0c8dda90962983af903086b9ceffddfedec7a0706230034227e46
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1