Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bc203efb0fb9bd…

MALICIOUS

PDF

306.5 KB Created: 2021-06-15 21:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9eb055b7f4a79977dce2287efdcabaf9 SHA-1: 3e2adf55bd030a57347fbeed964a7f619c13ffbf SHA-256: 31bc203efb0fb9bd2aeea345cd702c4238b73d83a4c079bee5bf680f3cf16a40
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains embedded URLs pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The 'ClickFix' heuristic indicates the document may attempt to trick the user into executing commands directly, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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.
  • 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://archism.ru/uplcv?utm_term=commercial+correspondence+workbook+pdf PDF link annotation
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b30f3f8b4---larodazoxu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a881f651a21---joxonaduzipewilapex.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d65bab51d3---tikowusewigepedekif.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce7463a9b511052ef08f2ecbe859da51/3279778300.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff402e017---55036309071.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2c0020e67f7be2e57b14c340b7c93fde/98580824600.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bafbc6babe6---soremovalotuvadirekob.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b212818c---63795473823.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e252c2ccdf---tepezoke.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0251b18d---vewupilowevuwizarukugisov.pdfIn PDF document text
    • http://goref.ru/files/file/23282333339.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/18e4aa32ecc68f79d73d108ff5d567af/jamasaxig.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8bipukt35h2for0lsbnqip0bch/litori.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c608ad8a3c7---92753957954.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/eb6714c17f55a34a9ac30ee0f2cfa0e9/27821147678.pdfIn PDF document text
    • https://nadamasristorante.it/file/34886068203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off00045655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45655 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0004673d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4673D 5500 bytes
SHA-256: 736b712fe8d0f3e86c7aaa3b379911073a0db5806a23fe05cae51d0bc40dd3e0
font_02_sfnt_off000479e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x479E4 12536 bytes
SHA-256: b9b4d02f6197b0d9296cb9fc08a58dd9b341677750af65ad23ed8bd57ff21a1b
font_03_sfnt_off0004a47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A47F 16532 bytes
SHA-256: 6748d31690a008d90a6511d89ee6ff1e35fbc284ef012ec604901503fb306c7b

Open this report in the interactive analyzer, or submit your own file for analysis.