Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62690eeef41ad9e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 16:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9e6faf2bcbaece7af99643b9340999e SHA-1: a070c6f67d8e1398ca487c5753b73b5d8f6aaa72 SHA-256: a62690eeef41ad9e386a419e957f421d8a30693fd59a4c5d74fa5e7021c2cd6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple unknown URLs indicates a high likelihood of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3283b88eb---36421527655.pdf In PDF document text
    • https://equalland.com/uploads/File/ramaporefigeni.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50122738520.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/53189619479.pdfIn PDF document text
    • https://ubranni.com/uploader/files/63055743096.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/13150920396139bd41806ab.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/60941316406.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161342b106ea9f---jejalusokikinexipipinega.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/80136161538.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/faxejubopasup.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/20164866111.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/parerefenixafebujekone.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/dikajanolubodude.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/84207037422.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/13886453963.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138779d039aa---2242358541.pdfIn PDF document text
    • http://terminsk.by/pics/files/kosajeri.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/7856794089.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/foguruvaguxux.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/41782424039.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/liwepimopegiporoposipe.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/56686439780.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sakozot.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fjgdk87r5sqo7d70tlpbd633f0/kopudilizatedulitawo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40087194073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apk+updater+2019PDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311341149491.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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10488 bytes
SHA-256: 1c261eb6f7566e07e9bc8764951c210bf5237595d2736470c4a5e065971aa789
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 19648 bytes
SHA-256: 96a10d5a21a4544d8a3b7b7007d9ab1cb7f68749e11de9059417845359c36a14
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1