Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ddd039a154cbef…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 04:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05b113e965289ceffaf47a9edf1ca2e5 SHA-1: 98c815c740ad3e66c65b1c152d0577f92721fa5f SHA-256: b4ddd039a154cbefb161840322864a4626f86870545043b815d3bc2db80bf572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/068f3b33953a9bfc91572fcbb98e67b1/52687365585.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/cbrhpa6u5075ot95p3isalfghv/44039347551.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90c7v9cuck2nhdkkrvic121op3/rolas.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/jojokadagutim.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf8c5d15d---tojerizumafidatu.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/xamonefakixime.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/90126224452.pdf
    • http://www.aportecnica.com/imagenes/editor/file/figitizaxumakobazixu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/nvhdrqgr8t1q1agpbibi3464d7/mowopiwumuloperifega.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/rasatex.pdf
    • https://nibrasimansch.com/userfiles/files/83012340215.pdf
    • http://geometrabottero.it/userfiles/files/71117616833.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7acd381d---vomaroworevi.pdf
    • http://maristaslardero.es/userfiles/file/68885313432.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/h8mm6a6mjvaggpt8qi7ha72890/xexarojometixivelafer.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3bab9a896ab9d36af9d155ca4248ff76/zugasiwuxo.pdf
    • http://didopack.com/files/setapal.pdf
    • https://dichvumayphoto.vn/webroot/img/files/74779122809.pdf
    • https://isosklo.cz./uploads/sanutuweduxoduwu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a055ea7cbc---kirupi.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vrgqn27io558n9iae7h5smhfrm/20082955475.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/nekajufamutuzenojapovulav.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061483bf6a---92674277352.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160dea264c9e36---fazutirigogaleritub.pdf
    • http://wanyuantemple.tw/userfiles/file/5664022906.pdf
    • http://akinmedikal.com/uploads/file/raguwedenojarijubakumij.pdf
    • http://vinmexindia.com/uploads/bazipivulavojamuxuzomot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=separating+documents+in+pdf
    • 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_off0000c342.bin
63ad1731cfaa12c0ec1f5353f8c854a6ae95a803d884cb19edda22352492359f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 11092 bytes
font_01_sfnt_off0000dce2.bin
35fae6f12e74eeefbc30fd6296ee72e6f1f31de8f1beb727fb4e00c9100388ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 16592 bytes
font_02_sfnt_off000106ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes