Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1322a906ac3f8e3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 13:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a69f82c792f98a61249537716e6ccd0 SHA-1: 49d4478d26ec1bbdee3ed512b4fac1101be11b38 SHA-256: b1322a906ac3f8e36b14680b651a37f3a3c88159563f9df5f8835e1ba667d78f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which appear to be part of a link farm on disposable hosting. Heuristics indicate a lure for a password-protected archive and a callback phishing pretext, suggesting the document is designed to trick users into downloading a malicious payload. The embedded JavaScript likely facilitates the download or execution of this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://irlanc.ru/uplcv?utm_term=navegadores+seguros+para+android PDF link annotation
    • http://elijasprojekts.lv/files/file/xafutisamazugifiw.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/82146755747.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/41615928701.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/82752776779.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133974933551---sorabud.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f111d88b60---wejalafolana.pdfIn PDF document text
    • https://peterdegendt.be/file/zexigawajitelomo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef3d6d9ead2af90f79a9c6fadbcba029/26039212390.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/valapixexilirejojus.pdfIn PDF document text
    • http://kesifveotesi.com/files/50000607659.pdfIn PDF document text
    • https://clinicscrm.com/img/files/3538962271.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5b101126---nenutadus.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e5f0eb45---13846637045.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wujiwevorojepomajed.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hqvi696khdsuh10cc42vo2383j/29293197873.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/bagixelosedarovibato.pdfIn PDF document text
    • https://renault-service.com/userfiles/dajodarekejudoruniwono.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905164244.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/tesepigasixojejibosiwewo.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/76119210789.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/walajexikomosetigoxamij.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/77701049226.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/20908305178.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/887355f3e1cb90e0d1d6ebe4c635689e/molesonurosoka.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_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 18600 bytes
SHA-256: 2ea1200a0363ab00b1e91949f084386a6619f1ae2d3fee3490862a87e016e6ea
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10564 bytes
SHA-256: 381ffe3607e2c66d2bc263e427e4735734220734c862e7e7663fbaf61a42ed24
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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