Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758b7522dbecd0e…

MALICIOUS

PDF

93.6 KB Created: 2021-07-18 07:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1357d81cab1ccdd1b1ada5b9543255e9 SHA-1: 00e2a53a35a524d6881cb8b63a643f6ceda44fcf SHA-256: c758b7522dbecd0efae33313d7abbd4cda336cc47ffe3e692a51f9a11acc12c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9495c3cbb---55907459918.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523135023_250894562.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ac701764ea4---4780275693.pdf
    • http://www.aportecnica.com/imagenes/editor/file/54215193817.pdf
    • http://sacoorhealth.pt/site/upload/file/55276896564.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/66700871854.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/22065757112.pdf
    • http://narcisse.sk/editor_uploads/files/gesob.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/22259409723.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/53679575733.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096fbba0761b---65420484060.pdf
    • http://www.allatpatikapecs.hu/images/file/12390353326.pdf
    • http://cableesmaltado.com/d/files/gogin.pdf
    • https://fajanav.com/aym_image/files/kogor.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bff2c73c9---dekinolevex.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f7ee21f2---13857072428.pdf
    • https://rewaqousha.net/userfiles/files/punivomiviniruz.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead797927e---87544007960.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b637473b4f6---divexefugesosizupid.pdf
    • http://fixafilm.se/userfiles/file/48506638025.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ab8bdad---buxunabex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=add+a+top+border+word
    • 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_off00010bc3.bin
d0e8710b751321523f8792034445d38cc47a2014887fd2325ce5c56cefbadadd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 18152 bytes
font_01_sfnt_off00013ae5.bin
1078bae3b606c4f10136db5f2bb38cbedc96afacf2f9ec0a94f6e28fae88ffaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE5 10184 bytes
font_02_sfnt_off000151a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151A1 16792 bytes