Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1ed927fa497605…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 17:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8056fe12f413a9c75a99b0529f928eb6 SHA-1: e0183c686ef85c6e5e489d4fdcdd30e5f8279a30 SHA-256: 4e1ed927fa4976059969fc1dff9e56010475db339602baf410ef892c1f83a542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://garglob.ru/uplcv?utm_term=download+ps3+games+on+ps4
    • https://am-system.eu/ckfinder/userfiles/files/45712108720.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f64eab427ebf9701d5ddbf198c7041c4/78327141410.pdf
    • https://hinodanang.com/uploads/image/files/larazexobezitunixos.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4a73ac2d8---52980711198.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fb7f765c18898309437f2fe1a869b57f/96350480356.pdf
    • http://amphorabeautyclub.com/campannas/file/kisatetiroxulo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1b5b2266---78245543368.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b8c3d366---bojativorinekiwowajejoma.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4ba771d4de326f4eba2bedef10bccb89/2113096460.pdf
    • http://alarcon-v.com/editor_upload_image/file/retokemedenevikolomelure.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5c3f39527c9d2eaf66734bbd2b2e7f8e/ronadari.pdf
    • https://aimhc.com/userfiles/file/95695920716.pdf
    • http://hungbuloon.com/media/ftp/file/ridovinowekubo.pdf
    • http://maciejabramowicz.pl/upload/files/file/tiziretanixibivi.pdf
    • http://palyavalaszto.hu/teszt/upload/file/35833615296.pdf
    • https://atamergranit.com/userfiles/file/viziz.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/95da10ee22ede49773dd570836c73c8c/xebifewezewate.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084703fa6a8c---kejizoger.pdf
    • https://repare-ton-smartphone.com/userfiles/file/83021701325.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fd9cc1fc---ferunemam.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160890e147547c---wuraxotivilasilalexibo.pdf
    • http://www.ecostroyservis.ru/File/vozirululawak.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_off0000f7bd.bin
865e613a7d04d7b44d340a01f71f1ced72af1b6c6557ae7ec8ec22531378b332
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 17180 bytes
font_01_sfnt_off00012454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16792 bytes
font_02_sfnt_off00013c6b.bin
bc98c880f2e5a808d1cc9385687306218d30e910d2fa690bf3ebeb196aaf0988
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 10784 bytes