Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71c05731981c24d…

MALICIOUS

PDF

176.4 KB Created: 2021-06-26 00:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c445510734184bcd7e7ed219ecb3611 SHA-1: 25341ce6e38cce99d204a574541c7521ab6ee6e8 SHA-256: f71c05731981c24d14b8b591b6d5ee9c5d52ba7cc01becfeaf71cf01b72b4db2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad5bf0201---78877285969.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/achk70j7aruv0ltddnkh9507pq/wekajususis.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03b35fddb---bogasupadovuwete.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/ca7358301d1719e7c8cc27ba88c5eefb/gurujafunuvugolijutimogek.pdf
    • http://skikk.be/app/webroot/files/userfiles/files/wizejageropibubokenubowe.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/guminirasixoganu.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/93849183338.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607434305f94b---88113526432.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acc81780c---pidawotaperifokej.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1356d348---56026327368.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q0022ejcnj88u5fumbmj70r2ef/sobusaxavibosokejitekuful.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e77eb8f82---dakuma.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8edcdc8022eaf4928434c1be279d0501/punokivubirefeno.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e1a58b4d---mubofomunulatitasivotodo.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c59b880---35853511381.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927abaee910---saxonegemumifibur.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe076b5ce5---42912170185.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/58928211452.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=significance+of+archaeology+in+the+reconstruction+of+african+history+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_off000248a3.bin
19e315babdf016d7eac8c5f94d36e60ed1679b692f97c028ce47f22178f98487
pdf-font-stream PDF embedded font (sfnt) at offset 0x248A3 22992 bytes
font_01_sfnt_off000281c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x281C1 16792 bytes
font_02_sfnt_off000299d8.bin
f4872306ad3754e619ef6306d352ed0f0c853ec1e1dd1083aa0bcf597b147ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x299D8 11188 bytes