Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a448f139b4a752…

MALICIOUS

PDF

84.9 KB Created: 2021-07-02 00:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d76a521ff09eb321221b9bc4986686 SHA-1: 3563565a97a822a529b034acbe8eb8a77c151727 SHA-256: 14a448f139b4a752516b7e941a0d1f92e0ccb2e1246e5f433c531b8d03501c92
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710a7201e---miwumugoruguvej.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns9lk6j1ataen90krkt9jmk675/59279400351.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/46558393147.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dcd58548b6e68e36fdeec7900e82e482/sudojugugitakuza.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9a36a605634fdec545a4951ae0dc3a53/duletavira.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac403d23f24---jovigobexigas.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94828cc84---diziganogukiwo.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/70395093676ea5f2e87920858b3e9812/nuseguv.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f448e2c59081248b91c3162fa2155c9e/39938326791.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/48022440985.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cbcda04a---98299794856.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b20838744---4267973472.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2ubi3e2lvd8u9dj3buhts2ker9/48654004145.pdf
    • http://jjmcp.jp/userfiles/Image/file/zonotuxeweju.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c0b2bb01a---rigediralofosav.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecbdac153848739428a7f1ca0285bdc4/18380975936.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4taeqedvcbi7s9ike1ft0n0he1/54948558729.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088992cc9e12---supevu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/079b2d4e38e9ae81493f5a26fa80eb15/ditalewigebanixuv.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/36n0nsrj2k7hku7lhf91f9coc2/vijakizujusezeb.pdf
    • https://loctra.net/userfiles/file/mapipuganinod.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c0f2a44c---buvusi.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/bofuruka.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2f6aeumig4d4e8o9vid6baesd5/64083160625.pdf
    • http://ngnjl.com/userfiles/files/gizarumebilozuwilade.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/witoruvimisopinamomasa.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072846a002be---22896623053.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sexy+words+that+start+with+l
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3d.bin
0dd82848ec2c5d273188ec8e6fa08ba7f93cbc1c29c09184cb1ec98307fda9cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16760 bytes
font_01_sfnt_off00011593.bin
1466a3bbb0fd291101e69c8e4cf4397c078f8bca094d203b07814b0c4eebce59
pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 10620 bytes
font_02_sfnt_off00012e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes