Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b94baed5c3d85df…

MALICIOUS

PDF

83.6 KB Created: 2021-07-20 19:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06b0ca127b172fe6af2f0fd792d2c414 SHA-1: 83f0ea1e15d34e0e1340b2ca13319a445e9a0e75 SHA-256: 7b94baed5c3d85df3b756bee6b9ce83ec2b84be46be30e5814d37ab58385dba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to what appear to be compromised WordPress sites, likely intended to host phishing content or malware. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078698558750---37659013145.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/4183693819.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/zewewaxapenowefimuvab.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/94d1629399c424fd3ac3487f5d3f4bde/20771802073.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c017e91a8---90519186324.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/57754950887.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/45920460502.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6703b668fbdb05bdf2995680bca661d1/39914868583.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/47300938091.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sasdub1lold5lc2f8afc73jk5m/73869471889.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jipusomaterezoxup.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nuzadejubafudolefikurip.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/wenixawimajamozelebi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/103722978.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/1174368539.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/nadejaropugufagazufituxob.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/24598740470.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f7ec205e66bb773ece6372bbbb9f062b/54330282398.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41857948c---fajutixutubaremejebuk.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e96ca938474c84304fd7e69ea15ff6e9/15096651617.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82e46be36ce01a204301e84794de4930/38410613811.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/woxude.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/bogawemavibanirobule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=simple+chain+stitch+embroideryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 16188 bytes
SHA-256: cdf8f334f55fa5f0ff7c70c61c04a852ffd32fd7f31d2da3ed8c9ae0b36bd36e
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 11108 bytes
SHA-256: 6b254b0199dadee8b3d2add3f7ef986c46455d3e0f3568601fb16b380658e9d6

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