Malicious PDF — malware analysis report

Static analysis result for SHA-256 4804f82fd0c0aa19…

MALICIOUS

PDF

81.2 KB Created: 2021-06-27 01:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04bd2e2c04d17ee790fae4ccdbb0370b SHA-1: d5832f74b8cce570c66785f27307f9d0889b0b21 SHA-256: 4804f82fd0c0aa19a4fb7bc30901aba25acac59ff736775be378b30bda405c26
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The file's structure and numerous external links are consistent with an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zjpjxt.cn/upload/uploadfile/file/27523389957.pdf
    • https://soudurelausiere.ca/upload/editor/file/13357282710.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2b7e0397159252d9a8f1095ec5e1fb9c/42015561236.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/28674256945.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/59f4e466b56a0027e0f78b7cd4b8dac3/76313565836.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fe3fb46a443c4d1d06f636daeda62d05/zupuvujawajidoxeze.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609def0e6dab6---mebuzobafafivusiveka.pdf
    • http://ipmarketing.net/userfiles/file/rinirevemobew.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeaeda3209---gumos.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/45795898003.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb6946f84---pamiwune.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4ca81dhgeve3rmhjfdioimp997/75941725499.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/jdirdrp6b3k3n3trku3mabobj7/laxejizogedituzuzezarene.pdf
    • http://asesorgubernamental.com/images/file/wewevesesumekosus.pdf
    • https://dogathermalhotel.com/resimler/files/kazaso.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e5684dd5c7d26d5f065e874fe3ff5b83/94242179363.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/47100626358.pdf
    • http://banghetretruc.com/media/ftp/file/kanuvabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spelling+start+with+r
    • 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_off0000da98.bin
99e14351e410215ba03369d4eb912fbfe206388978d1d473c392a3af26227bc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 17392 bytes
font_01_sfnt_off000107df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
font_02_sfnt_off00011ff6.bin
1bd54e41a5aa63d8aa2b5280dfe3234d05f7e17918acae71dd48eb46c5f11c01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10572 bytes