PDF malware analysis — malicious · ba787565f120c25c

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 09:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4ea355b98d0f1a1eaee8171015303af1 SHA-1: 1ece1e7e622f7feaa9b364fc810f3f9a3bff5d61 SHA-256: ba787565f120c25cb2a5288eb084dd088a077ff879440e2ccf4fc6b88373f22a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or malware distribution, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://laborke.ru/uplcv?utm_term=best+toefl+vocabulary+book+pdf PDF link annotation
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd44c7e8b98---67258247017.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/39vml14hmcio1k9fjq0ngtk7g3/50233041100.pdfIn PDF document text
- http://thetestmag.com/userfiles/files/xamulubo.pdfIn PDF document text
- https://thibiditrading.com/public/userupload/files/81269545760.pdfIn PDF document text
- http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8909ce95f---90760461108.pdfIn PDF document text
- http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52515715526.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9b80eae016871d4f693b6e635f2f6339/gosuwudilimedabisebajop.pdfIn PDF document text
- http://stl-hk.net/userfiles/56519394129.pdfIn PDF document text
- https://digireg.li/upload/lagerefavezomadov.pdfIn PDF document text
- http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/8178648302.pdfIn PDF document text
- https://okinawa4d.com/contents//files/25182531395.pdfIn PDF document text
- http://dgjst.com/upfile/file/dezevuda.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb5f04f24---febewotowalojoxudifajale.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/14646870936.pdfIn PDF document text
- http://www.bandungmesin.com/file/jefonukozadomilubo.pdfIn PDF document text
- http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/78780661208.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a02ac2ce4d1c66b3b67bfd5173f9879f/lasosoluxedeniku.pdfIn PDF document text
- https://aucordechasse.fr/vosImages/74747426060.pdfIn PDF document text
- http://jocoseatee.com/userfiles/files/35422889899.pdfIn PDF document text
- http://web-news.eu/www/pkpar/userfiles/file/9518208866.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/noxogizatekelakemekufora.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e13670e75---66461453911.pdfIn PDF document text
- http://chaitraglaze.com/uploads/sutovelezofebologoximo.pdfIn PDF document text
- https://www.assofmt.org/ckfinder/userfiles/files/30264539429.pdfIn PDF document text
- http://waterlootour.com/FileData/ckfinder/files/20210621_DE87CAF5F909B558.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1c28c348ae850e9c54a7aed64ff01a4e/26814007253.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/6234280132.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e45e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE45E	10980 bytes
SHA-256: `5f0dd80876c614b61bd5d1084543036b6f2b31eee48fd7832065a94ef3485102`
`font_01_sfnt_off0000fdf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDF3	18564 bytes
SHA-256: `211e65bf574709bdf02619a0143648880d745268003277cd560346b71f5bb7ce`
`font_02_sfnt_off00012e4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E4A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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