Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1c8770eb68b76c…

MALICIOUS

PDF

207.7 KB Created: 2021-07-02 00:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6417dda0036a98f441baa2165bbd5549 SHA-1: 67c96d656164008835cb16d76d7b2ddeba2b9012 SHA-256: 7c1c8770eb68b76c7524e8e29a95fdcb0aadcbc1ec5f79cb402321b3f2d85eb3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's used to distribute further malicious content or conduct phishing. The presence of external URIs and the compromised CMS upload link farm heuristic indicate a redirection mechanism to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/93b403pm09sr9fok3ons9rsgua/doginematukirazak.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e87d6f63b---87124362046.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jiwunanured.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f75484f20764a1bf754d939ab176ee51/wekijusun.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e4f5269bbb7be9bb5c40d53e23a352ff/womipekasaboxa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/272acb48aade8dc0df47b6be32fec6cc/1606740544.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608027716df57---towujugezub.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2d8716c1---8435946302.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/62992704106.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/bugezazimuxabari.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b559b6518---pegetisukeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80370dd74---47603358530.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/27249334652.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c64d50ebc5526d51406461ed42de87d4/kevojewozutosuxoxodezule.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/motagafebigezo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/8884618074.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/14208113650.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/83221382121.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d5itl4o5a8dkhklh40p7q4mvc0/10371292795.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kllccllpu749oae4ojjhqu6bh3/5235141124.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d01ec01f9---42828526182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=control+of+typhoidPDF 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_off0002ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE46 18956 bytes
SHA-256: 4e15f9d438572b22aacfbe24ff94f6afbad1916c9f493f19ed2a7d01889d1a43
font_01_sfnt_off0003005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3005B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00031872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31872 10280 bytes
SHA-256: ba33f816e77489fd56c4d5e2c8dabd987be0f47586bc5633b54637005eaf1d1b