Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c932f36912683c4…

MALICIOUS

PDF

95.0 KB Created: 2021-07-23 20:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eeffbac5a7dfb2f75572159a1eb26d1 SHA-1: 5c304fc2afe0b178acb2d85d680035f656f4cf27 SHA-256: 3c932f36912683c41a12991e469a84abd35fcbce803b5a13789bfb499e822b4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters indicate a tactic to improve search engine visibility for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160843d81d2334---18195425157.pdf
    • http://csc0512.com/userfiles/file/20210625210013_78oi5m.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece4905030---86855734407.pdf
    • http://bettynblue.com/upload/fck_img/20210513/file/labisuvazarinewi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea271955a---71066320584.pdf
    • https://eminencesolutions.in/resources/userfiles/file/sowab.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec0267c88---nukime.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/99154896132.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92408226ed---79195351551.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/85572330605.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rusujepolu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517fe9ca07---gaposodiwututute.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b981c566---79504242362.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9tmgchfhkf2vdggcnk3l11kfgh/98092345347.pdf
    • http://studiodrago.eu/userfiles/files/baletodokuvesisowuloxo.pdf
    • https://bhsbeacon.com/FCKeditor/file/2853422073.pdf
    • http://vetportonaccio.it/userfiles/files/81917042743.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061287cd41---88758620824.pdf
    • http://elma1.ru/!upload/files/bozojusijalofolejetizu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6e2ef843---bonaroxokamekomoxokib.pdf
    • http://longvu.vn/Images_upload/files/84053489442.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07951dd636---32572794556.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/jikofidu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608773f952577---babetigilulamasezobuvowok.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c528dfe21ae---wixezisaraxejuduwepuvu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+download+youversion+bible+to+computer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75c.bin
49b85f326bfa46aeea11e7992f9b2f91d36d97395facfcfaf4ff2f3cf322b0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 11172 bytes
font_01_sfnt_off0001114d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 16792 bytes
font_02_sfnt_off0001295e.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16144 bytes
font_03_sfnt_off00013ed9.bin
5a69622d0e078d005dfebbdc2705c1e1347ed0e455f8945d54f4bbcc825ab51d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 17620 bytes