Malicious PDF — malware analysis report

Static analysis result for SHA-256 87214ea2580ea77e…

MALICIOUS

PDF

107.9 KB Created: 2021-07-24 02:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb96f4e77acf6773af8e6e7db006a262 SHA-1: 5dc1a8b08601aea8bd2266a527780a5f7f6a9163 SHA-256: 87214ea2580ea77ea4a6dd8ce00a8e74f02073580728c58c4c1c99602e41569f
196 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple domains, many of which appear to be compromised CMS installations or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://usaoxin.com/userfiles/2021-7/file/86916206103.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/23746fa8ae348d8832d434802bbd336f/gibomigaraf.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v3sd0l8vho5222nrc7l1c6atv4/31390459927.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/52ddf4a289365b53a4c3d12569be4a8b/wezuxeda.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q5spcrfee3sk7445eklo3b3a3k/60307817216.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a308cea8b4f---44778871782.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a08e4f223a7713bd1d7ab936e1d615d2/sutiromelaresu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/111e12f03b18f82cea1876c0a8835235/wisalumej.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fbcd4a8483370e738665cba03a6a2418/xuwitadomekem.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756cb5c8851---92751131112.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/84457450756.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1e05b4b1404b0840bfde103bb187dc5f/6105336111.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/24518831867.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087f327687fb---wurajavedofolemes.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cf1c7430f8977428d47ec994539ffde1/70299608568.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ebtomltsh0vk5l4vqf2pmckhgl/repuxepizak.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ld1q53er5hugqb1vhr578n3203/wobuwu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/42567465029.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/50993297477.pdfIn PDF document text
    • http://kag.fr/userfiles/file/35418046978.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/fn2n04t4juk68ki7in19tnk52s/14596335149.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i3i09gqkmo139i23rdabnmntu1/kilobivegosobetaninojodef.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f585e232a---fejovopodizulijulajup.pdfIn PDF document text
    • https://agatanorek.com/files/file/bapovifafaxa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dojozobodijixefude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=descargar+m%C3%BAsica+gratis+de+grupo+laberintoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 17004 bytes
SHA-256: 065f649f23a9310fa6640b29ac8c75c02901c7d82a5230c4d6ee0ff60a6431c0
font_01_sfnt_off00013a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 19792 bytes
SHA-256: d07dd94bc2f58a13d03e054588f086ac373568f7881c891ee196fdf3b286b725
font_02_sfnt_off00016cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000184ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EC 11216 bytes
SHA-256: f8e125a06119180251ba7690090d28538dac89f299810277031c88888ff520d2

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