Malicious PDF — malware analysis report

Static analysis result for SHA-256 515433f37cf3e738…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 15:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1743307f5ede13411b88372ef1f363b SHA-1: 3ef497089af3a4324a4afe94608c6b873d4cfec6 SHA-256: 515433f37cf3e738cb781ca6a9198cfff3caa4b8b6adae97d296e0dfc9a24b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609353d1c0ffc---93342904504.pdf
    • http://guides2alpes.fr/uploads/file/fotix.pdf
    • https://heatingboiler.ca/fck_upload/file/90890994619.pdf
    • http://vidol.nl/userfiles/file/guwukixixinuzuzerefuzilog.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089044d83b1d---jisupej.pdf
    • http://parvazyab.net/basefile/api203/files/pafigigugisutekov.pdf
    • https://foundryindia.org/userfiles/file/85204295071.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/53169b50c6deb49688f25e544f696d80/forijimeb.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983492e8ddf---47294677966.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5df35cc2195ee1bc8ea772c919f5cdd6/bilaremeki.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/f9pfhmecf4rrbadk5o1vkqoq1q/liwosixapixewi.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f087775d8---33005697111.pdf
    • http://krakow4you.pl/krakow/files/dujuruzapumamewixemiza.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5eb76b219b00c641f1b1b77edf593ed/jeradibapa.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/rozomo.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/49419594292.pdf
    • http://royalwedding.jp/images/blog//file/tazofes.pdf
    • https://autotronics.vn/userfiles/file/silul.pdf
    • http://matras-devison.com/upload/file/fepararozavuvanowujun.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/dce2e86d964d3c78d1dd1a41d4056860/xovedunavasuxijuvuj.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/deed9b330ec088cd858f41f9bc02c2b3/50556784120.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/022652c40b10b7d2c357135021c7bb1a/28949380913.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/35970498306.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/54598894908.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/295ec8679748b9d38a41352506599207/3834789903.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=i+can+move+my+body
    • 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_off0000e7a7.bin
1b901988119738f07cf80d71442d61ba875670167b30c1174d645b65eba77894
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 10296 bytes
font_01_sfnt_off0000feda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes
font_02_sfnt_off000116ec.bin
bc420ccf13de1896cc6b8c64059e93733daf7687f74cd45763e303f4c740b1da
pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 16924 bytes