Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ed1a8dd0692a91…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 14:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e1f9f10e7c63f53862b6bf004eb1d5 SHA-1: b60f7b0fd21bff2cee923162ce677a312f5b24f5 SHA-256: 25ed1a8dd0692a9102bb0693c783da1b75b9665cd0b4a68060b14498ec536ce9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://area34.info/wp-content/plugins/super-forms/uploads/php/files/gfo639b9tresckfi3f4hhjhbf5/situgelebugitelidon.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a919da911---18432364933.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb4e727d0---lidatorewalukiwivok.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/68522555588.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091928c8899b---25291104890.pdf
    • https://mayurherbal.com/userfiles/file/84178685493.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8d6909aa73cb80dd037ed680f711006f/55408289458.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/wulutuxulimasedorudaw.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3a464ecb---69084396434.pdf
    • https://bouveau-consulting.com/userfiles/file/48071284498.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rmgp2fgiibhqjep6ctljin1u6l/dosogilaxesub.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1cr671500a9e4bk3h38clsbun2/zasawuxi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc657e5b24---96821451379.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tdj84ue2sa5uu893hfq2bt6bpj/lejokutujagavofigupej.pdf
    • http://lica-mpt.it/userfiles/files/55418987337.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/q4q13qkerupmg1h1ioape849kb/62159260218.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484b2302c9---gezusupepozelonob.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9656f8e476---lujijekasonofitagixapav.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f4c981a4c72bbdfae02facd236ad78b4/gopapewonuvilasugul.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kopuvoj.pdf
    • https://psychologgia.pl/Upload/file/11360535804.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/8914649647.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/faboxemitodakelozugobefe.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1c086f1ede775d75d858a2737e21542d/dizazuxobusipe.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a270f36226f---xowidipasegoxofojuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=brother+mfc+9440cn+scan+to+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_off0000f550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16792 bytes
font_01_sfnt_off00010d62.bin
399089316f39138faba4f70f7543860849fa7df89aeb647c6736cae4036c2cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 18128 bytes
font_02_sfnt_off00013c73.bin
1f89f479f8c1a92d7bcdf44c256e6479c789393f92d699e3f767668e09932cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 11168 bytes