Malicious PDF — malware analysis report

Static analysis result for SHA-256 c342d8cc142183c3…

MALICIOUS

PDF

97.3 KB Created: 2021-08-21 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4e9853150b3fb68bbc89aad7e6173c4 SHA-1: f037df3cd418a126796978f7f207c81e050bfe56 SHA-256: c342d8cc142183c3fbe3aa8e103f4bdad8a75a80532db9ea8110e91f5a87bf51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ckmandarin.com/uploads/64691533537.pdf In PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9686f9309010e6502428271f56897ec/34120954831.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/dugulenawabobuferifufu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea1c3f3ab---35870533303.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920192700b6---kidijus.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/35700506225.pdfIn PDF document text
    • http://turnyras.lt/Files/file/zuvamusovademete.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/xenakelofuv.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e8aa309f0d1ec16d698bd4d21d0e6341/45312498871.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/jebenazipikamiboxolagese.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bumunirujidemetevi.pdfIn PDF document text
    • https://wittnebel.dk/file/84234009594.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/irml5qhsf3us3batse7o9ov4o4/girax.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ba2fcinrabkk4lj4viemt22k0/megaxajadisubasenawafezu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bqmnam4elud61utob4djkdug6c/kijojasu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fe5cd223ceee3c70465d1680f406d805/kalokofa.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/19897411433.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/8950181353.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/3520183716.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6c22a45c9c719ec0b501377286255f2/61928788498.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0832ac284f4cb30e25a0ba15a2af2555/lupox.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8024ca1affcfa7ad2f5e4fed1426e803/35048379678.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/58005c2a1c10d666746707780f3bdd65/41969375377.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/posodadivoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+brain+repairs+itselfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 10568 bytes
SHA-256: 9f7a7cae6d03ffb8337ebacdf9967969c5c979763922633c14143a7bc04fb867
font_01_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9B 17104 bytes
SHA-256: 02063c96dc1658cfc08c43aeaebcd3adb5f49393b412dcc2869116c7424850ac

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