Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dc784321254e46…

MALICIOUS

PDF

92.1 KB Created: 2021-07-06 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cdd56eb67a01561e3070e3c86bb0e69 SHA-1: 430656eb67d6f6892ec890bd3dc1a93f9c1036bc SHA-256: e5dc784321254e46acc6f1b884d9d6c8b14c97e9720b9c05f150af5e31a9d389
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ceomit.com/fckupload/file/45090171772.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4f79472e---22262456435.pdf
    • http://agcslohian.com/userfiles/file/16247143988.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748c56e992f---12533349073.pdf
    • http://folientastaturen.pl/_data/file/13997261467.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ppg9snadbr4a3p9gfc60ifjtr7/nojefunivu.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090732f798e3---3293392291.pdf
    • https://cahayaapi1.com/contents//files/fugavalix.pdf
    • https://3drm.bg/uploads/pictures/files/mopifirijedikujel.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/97654631480.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/luvewitinekuvawul.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eac88d9633---40137909554.pdf
    • http://baovevietnam-vnss.com/upload/file/99027850845.pdf
    • https://bouveau-consulting.com/userfiles/file/11906631969.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5f8ljmn2okjofn3c1oc9so1bn7/mazogodunuwi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2b1b10b8f033b30fa4c4dec0e800eb85/kiviganuxogexag.pdf
    • http://birnagarcollege.in/userfiles/file/3963406662.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4555a69674c70fc6f47cd450bc241b20/loxulefijas.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/17124071738.pdf
    • http://ural-resyrs.ru/data/file/relepajonowinikijej.pdf
    • http://ilkyoukais.com/Images/Media/files/semis.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zamalimovezorazupoziva.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ss22biv3jl8enj75n59togae64/67011549546.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609138a870178---lupasawixikil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=there%27s+more+in+heaven+and+earth+horatio
    • 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_off000103c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 16792 bytes
font_01_sfnt_off00011bd3.bin
d5340468404ef7bdc915ff2bf64d7f99b9170e680509d4bc3516a67d72ee5082
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 18184 bytes
font_02_sfnt_off00014aff.bin
4926c4d3b6a072061a37a93d51c23b7d86be5d6ecbdf8637f42898c83421c490
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFF 10532 bytes