Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c7cadea9c0cb1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 09:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86a9d9cf3534c5c78ab770e534e26d74 SHA-1: f2d12b88034aecc98f2cacc962697baa5db63f85 SHA-256: bd5c7cadea9c0cb157b22bc079ba75e151cf0bf15a87e2d3d7420a491fa63e11
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure aspect. ClamAV detection and ML classification confirm the malicious nature, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d53bd75---sipogusi.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39a9a2747---65297324619.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2072ee56a---64740798154.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/958a435c4ddddda14141b57fd91b1012/20866613471.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4054c4d5b---49675598117.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607950d34b95b---85286320990.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/rivujojegemunigefenonorap.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/30466193815.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/85310499768.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/61174609324.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073968691705---juwijujuxu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70748e580---tivuxopiv.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0ec84126---39025987085.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf7c8c74---ganepuxakosodovoxexizaz.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rotuvasobuzonokafidadon.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/liworivekutaduwanebep.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52bb7fddfc69775b1791319ae87af7b4/58646955603.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b5b410be545fb393c7f30c3eafcd512b/3009043072.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfff2f48d67---tufesunofa.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kl6r6jjlsadddv95c6mgjhetnj/82550689437.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zavinodibugosezunemol.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090c303d475a---40351929884.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/46048861638.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38111dd21---76016341336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=brothers+full+movie+download+mp4moviezPDF 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_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 16988 bytes
SHA-256: 84864c4f3e7b5d903b3fe40a678bfe3f6919384cdea0ec1dbb6faa105d08fad4
font_01_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 11208 bytes
SHA-256: da217444ee988406c50085a0c96aaea691d5c6c1a99cec608aab34bcfdf92930
font_02_sfnt_off00013dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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