Malicious PDF — malware analysis report

Static analysis result for SHA-256 622805dcdb343c4f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f048a142159e90f02f65502861674db SHA-1: cfb58c51860924d3ea80f8acc6e82428c5dc8390 SHA-256: 622805dcdb343c4f865dabd79a1205af77a09df5315905cc7110c5c18f953f4e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://csc0898.com/userfiles/file/20210806120646_b5wl5o.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/64523750527.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/h5ssi2mbjbvr9letp90em3eo7t/togejonuzozisid.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/32c2a5f61df9dbf5ded7fff2d2a868ac/kulaf.pdf
    • http://elitk.ru/_files/baxeki.pdf
    • https://svingenieria.cl/userfiles/file/ruxokamurimefixekame.pdf
    • https://mosconi.net/userfiles/file/linapowizak.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e680d6d4e---gegupifubizofaduso.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf054e9f1d---budigazalerefusuxaxugevu.pdf
    • http://jl-vacuum.com/upload/files/72399413517.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104300454326496.pdf
    • http://nemdanangpho.com/uploads/2021-06-06/images/files/mujapufederevijog.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/24535011501.pdf
    • http://adria-ex.com/images/blog//file/79710786266.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/48b8cf5bb4f96a97ae5c0b46ea933fd3/33835731446.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eeac75ff2---muvor.pdf
    • http://agro-vostok.ru/userfiles/file/51327943987.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf794184bbb---95798619195.pdf
    • http://decaiyun.com/upload/file/210813085628657434gnfrgj845fwi.pdf
    • http://www.aadhar-interior.com/userfiles/file/xelojefububutixefapuxela.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0048b399---48680058238.pdf
    • https://aneri12.cz/res/file/55359834003.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072207ac3a78---bidizu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c8b775b55---lofelejerusiwavizuji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=finding+perimeter+of+polygons+with+missing+sides+worksheet
    • 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_off0000d4c1.bin
d2258050a97a5163a8f7f9d36d1cd6ed8f23453bf5f207a7509a304f0de3390d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 18184 bytes
font_01_sfnt_off000102fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
font_02_sfnt_off00011b12.bin
91505032d3addfcd1155fddfa028d701a0ac81329fec4c5ca22a5ecf2a174d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 11052 bytes