Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2cf55c4bb814de…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 16:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16cfb31089920fd88a2f186c1ee3a3b7 SHA-1: 73737aa1c73ce1779341cbfe44f1f57f0870d129 SHA-256: 4f2cf55c4bb814de03ffefb27e6491b97a97e760c0fa96f74384f340adaa7435
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. This suggests the document is part of a phishing or spam campaign designed to redirect users to malicious websites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onroerendgoedindex.nl/images/uploads/fixemefizuv.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/62b3c291dc6eb908ba74d9560a05084a/kapojuwigejawuwikumimug.pdf
    • http://heyumpnd.com/userfiles/file///66183487776.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/3l1ofg8kb2pbgp2ev034pr9c83/69306189118.pdf
    • http://nenorm.com/files/files/poxejosodigegodozuzorisu.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6tcec3put60dk2mu1kfqpnho10/dazedanabife.pdf
    • http://topenglish.sk/app/webroot/gallery/files/nijoveve.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/4091228583.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fsenb6u8kiod1b1voin0agbv89/sexabiwageta.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842e69b41---98926350525.pdf
    • https://brtim.com/uploads/wysiwyg/files/7534779719.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d3f54b57---18586598700.pdf
    • http://fs-select.com/images/blog//file/61686672972.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a551ef92e95---babowavekugoma.pdf
    • http://15449010.com/FileData/ckfinder/files/20210805_5340587390022AE5.pdf
    • https://ibeguiristain.com/userfiles/files/75634167615.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/91055956045.pdf
    • http://samtle.net/ckupload/files/42031293499.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107281303092277469z2xdm.pdf
    • https://carcable-bg.com/uploads/pictures/files/78118530445.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f9398a37---fozisisesobug.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/kawut.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1fc899aee433db7fdd4ce2d486a2ec6/lipidimelozik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=with+a+big+heart
    • 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_off0000e058.bin
d96032b5236eaf8ac09270a89a6f0d430886c93a9c85ee15ed14d573fdbfbc4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 10080 bytes
font_01_sfnt_off0000f6f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 16792 bytes
font_02_sfnt_off00010f09.bin
3a5b31e708826f3c237627c5952b59af1aff2d786f0bd04a6cf166e1f561deae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 16956 bytes