Malicious PDF — malware analysis report

Static analysis result for SHA-256 26510daa4bf06dd3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 01:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6dee987ff0a1fd0d528a9fb33184430 SHA-1: 656ca7725b75444509ca9148a1b64d2058ee63ac SHA-256: 26510daa4bf06dd3735bbdfe0b8736798608e7c316b66207d2d8a8e81cda849f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuacuongiare.vn/upload/files/74827981384.pdf In PDF document text
    • http://moiarchitekci.pl/pliki/file/55614295971.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bozaxuwozimetasi.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/31261565135.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/lazixatulebo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b76da6c50---puvologivusofoniwasi.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/8216218630.pdfIn PDF document text
    • http://rcmo.ru/upload/files/5076721144.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/62525935048.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202196214444172.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/guwokefebanosobasifarisez.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/jarujulobufewez.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/68783716945.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/98773562084.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63115288400.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132950046999---95806904891.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/64518493981.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zopapabovobutodi.pdfIn PDF document text
    • http://techbis.pl/files/file/deritunewalakureg.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161465a947afce---96208121058.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/92718481526.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af57bcb08d9bb11fb48c75d965cc911f/gegadujexi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/joxutafiwemoper.pdfIn PDF document text
    • http://net-marketing.hu/images/files/jetumotevukogok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tekken+4+android+downloadPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/22273783306.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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 17420 bytes
SHA-256: 579677302aeedf3afbc9d3807db9321b796473cb60a647235f5aabb30b9ad382
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 10196 bytes
SHA-256: 49f162ff843ad660ea294226931b5ef6a64d4441b1c47247913b332af50be606

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