Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9d6add584aa562…

MALICIOUS

PDF

74.6 KB Created: 2021-10-23 05:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 54d9aa2c9d2126b25d089a5ecb832751 SHA-1: 77b746b34e25b30d58b2699cb881070f3d63d72a SHA-256: 2e9d6add584aa56210c44c95afebd1fd3a0f620fa930821fcb3b81d84f1e7745
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://heryeryesil.com/resimlerfiles/webekalobugabok.pdf In PDF document text
    • http://domexpo.ru/up/file/18728703357.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/viketuvakekifofobe.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/66042276412.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98383491899.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/fafivetufinixilelupip.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/xasewemakukuteligirini.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161693c0cee343---gugenuj.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/pawenivagupo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/gomudinebinojolivewizanux.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614993e5de30f---64030226529.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/kagif.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/59298158289.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/mitulatazanetafonowoj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16158d55c6781b---xisixa.pdfIn PDF document text
    • https://hse.tw/upload/file/xeromimejaxijosije.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/28664002552.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/dinagiwebopepanadogu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613718ed2ad63---welakifujizasamorifid.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/57747043466.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/58077792079.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/50988795159.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/38874953999.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=draw+a+puddlePDF 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_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 9988 bytes
SHA-256: a8acc9d9dc276ea726729dad42b731db706792442c46a680a0775bfbf376fd5d
font_01_sfnt_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16824 bytes
SHA-256: 71c773e3356572ffdc6a2425fc879134da2d7269c5af691e9ba4d6d893548b9c
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1