Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821f373a174e2f0…

MALICIOUS

PDF

99.1 KB Created: 2021-07-06 21:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64ce7524adf516742b8b0fad50a92edf SHA-1: 5383b5a6ac4d1678a71f9ccccc9631fc965945d0 SHA-256: c821f373a174e2f04bf3b716df4d000f7da79356e44bc2a0d42d53e92887481f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=candle+making+material+shop+near+me
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/64976170085.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ta2furuvs5o9ecmgns8h60vsd/98750876765.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9k7sibrlc98aq823c5g0rjote5/52951230375.pdf
    • http://emurus.jp/userfiles/file/rasipolufafam.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a6323a82---suzup.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/35e41f5a4e13049210ce2ca3004d1dc7/sivipoluse.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d17bc610---tixakebikebe.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c93842a8a---33433890384.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ce9afefec8f3acc43376a6c8380eef91/nakumu.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/vixuwujodusuwi.pdf
    • http://cloverdiamond.com/file/lejokuworefe.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/69965330965.pdf
    • http://fluitec.fr/ressource/site-image/files/vifekeweriverilimad.pdf
    • https://samavetpharm.com/userfiles/files/77452471555.pdf
    • https://chptravel.ir/data/file/lefir.pdf
    • http://aarogyamedico.com/userfiles/file/75779837792.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9c000c04---fekidujomaxuwinizoko.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2a2d887a---96348798259.pdf
    • https://arerp.kr/data/file///80592593217.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba901f753---zazasisamulagexowiliwagi.pdf
    • http://ngor2-3.com/file_media/file_image/file/nebax.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/89kilk1jg981tccaqanbgmg6b7/noderojiposuzip.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f9d9187e8d970e3c40974d924ca56243/fawar.pdf
    • http://christschoolblr.in/userfiles/file/49208507443.pdf
    • https://p99.tw/pro_pic/files/pifejofel.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_off00011ff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
font_01_sfnt_off00013809.bin
908993a0919c6e938c76e780db33a9053ce66e9e9c1990ca8de688627dd4960a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 17576 bytes
font_02_sfnt_off000165fe.bin
1f1fec76cb8e5ef471d1ef41989b9a2491ab2c8cd5ba0a36f29111dbf7b2b244
pdf-font-stream PDF embedded font (sfnt) at offset 0x165FE 10964 bytes