Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c51044435a57ca0…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 17:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f347f91287115de5596b934b814237 SHA-1: 2ba3a8f53c3542059656a444c9d8e50e47096284 SHA-256: 2c51044435a57ca069bd19a57038f1282d6c627221f0e0654849d16e5cc19456
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

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://matsonconstruction.net/userfiles/file/16925195744.pdf
    • https://luminex.pl/upload/file/61157023354.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99306848786.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2911b77e85---99106452190.pdf
    • http://domusanna.it/userfiles/files/wivowowejili.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8984e2a3a---91908425094.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0972500b4---mefaxurubupakepadetaj.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/utc05ln37v3fas7vhvid0skjnt/wusomapetasodulorobegib.pdf
    • https://bd-sokolovska.eu/userfiles/file/tuwevumarokomekijas.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0fd07d1aa---96553409505.pdf
    • https://reitinguok.lt/userfiles/file/dapulewipadopowopudarawi.pdf
    • http://shqinze.net/admin/upimg/file///bikadilimaputegok.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/komor.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b27e56fe---61990249247.pdf
    • https://fnb-concepts.com/images/uploads/files/43460629599.pdf
    • https://ipekyolumedya.com/resim_galeri/file/86513444613.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c04acc8b1---60066890273.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493f2b43b0---votikagak.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/68390518302.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/wagidiwava.pdf
    • https://alnahamgroup.com/userfiles/file/90038754313.pdf
    • http://top1np.com/ckfinder/userfiles/files/58933922255.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078397d712f0---17465043098.pdf
    • https://skvely-kup.cz/files/file/89932348400.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c898785331c---javelilebejofomisulumavab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=balanceo+de+ecuaciones+quimicas+por+el+metodo+de+tanteo+ejercicios+resueltos
    • 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_off0000d79d.bin
d124d176bbc75f6f86f659679e2016360f2580c43eb3916fd951ef3252583445
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 11104 bytes
font_01_sfnt_off0000f138.bin
88fbfe0610dd8551aeadbe1db86035836692441fe4bdd6d310b9ca64c62f516d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 17432 bytes
font_02_sfnt_off00011d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes