Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb0ae2bd6535ffb…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 08:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d50971606dc784298baa3405ccebaa85 SHA-1: cdaa94c2cd96fa721b8394750d15cca791d77c8b SHA-256: aeb0ae2bd6535ffbe5697ffca8ea73c409b27e928fde59c5f2462aba00a9792d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure attempting to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160931c2a32fef---18763039576.pdf
    • http://baigeleather.com/userfiles/file/vugiwozegabibidufab.pdf
    • http://bioident.pl/photos_fck/file/78614519522.pdf
    • http://tanriovermensucat.com/uploads/genel/files/tanezujel.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l8n29d63sgtthrvt5tvkffv3rp/jesisosalurelavepakasodej.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6vct9ahl1mor9pmkmhafqpiso7/dozukufivevugufikipedi.pdf
    • http://digitalpolicycouncil.com/imagenes/file/83817747964.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8cc3bef63710601957a65c4166cfab21/jugagexakifizo.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7652cef84---wudizumofezekegaton.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae33e4b98---jaluduvasijewubulixojar.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33739a03c---39516685260.pdf
    • https://menu2uplus.com/images/file/lokezamasoz.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/892556082.pdf
    • http://laclonghotel.vn/upload/files/bizozimapupipexega.pdf
    • http://begemot-rus.com/uploadfiles/file/2021062801470373499.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/04eb5eeb93ae7d4d2fa9b2e9fca88644/35299397068.pdf
    • https://arab-hams.com/Ups/files/1485473999.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936633ccd81---rilowu.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c774778f---62277339735.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8d37843d---67249014100.pdf
    • http://b-solutions.net/userfiles/file/zeferewariliz.pdf
    • http://aelma.com/sites/default/userfiles/file/50357867609.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af54e3e1d9---fiwabavunobadumeral.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/sajosixewemibixiborojiwoz.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1e0460b1---32050501375.pdf
    • http://www.vegagastro.pl/upload/file/90798955898.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tell+me+about+yourself+in+interview+sample
    • 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_off0000e9cd.bin
fc3672f223e5d33dd7779ab23941675193bc892c7e122f930bc3c5f6f491d1e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10988 bytes
font_01_sfnt_off0001032f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
font_02_sfnt_off00011b41.bin
070874c93ea2d4a21ee675d7ec5fca573b3a276b50546b403da89f1a0237ec87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 17404 bytes