PDF malware analysis — malicious · ec9f9e5d33e85298

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 09:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d4875b2aeb26ef7d8321a43efd61aa00 SHA-1: 67bdc3b70ffb526dfc71ff6a4e7cff17d457f208 SHA-256: ec9f9e5d33e852983c7be50b90e9e1d54ba4245eae5a5c2850010032fafcb810

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, indicating a high likelihood of malicious intent. The file contains numerous external URIs and embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=olympiad+math+class+1+pdf PDF link annotation
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/867qp7hkkt19ia98j579gcp4m1/wilifusetax.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jbkm2a3j5mi6ocf2hl9uqtmc2e/wetenidaranenuxolajux.pdfIn PDF document text
- http://www.samuitns.com/image/upload/File/29467151094.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f723de43e7---62112230830.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/wifetebeforoxijobavotiv.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/86495373038.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b55067c488---81074852026.pdfIn PDF document text
- https://osikovo.eu/webroot/img/content/files/33368865722.pdfIn PDF document text
- http://autoservizimensi.it/images/fck/file/98528521597.pdfIn PDF document text
- http://seoulgreeter.com/userData/board/file/rigokejususizewemite.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/r1ckb3ij5369rn563auggcpnf4/39580011983.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6d0758e574d216b040eb03f9585e2016/69230830129.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j3o6hr81p86bklap2sjp1hvjk4/witixutefanojawuriku.pdfIn PDF document text
- http://aisef.org/uploads/userfiles/file/file/funipeginuveket.pdfIn PDF document text
- http://www.centralperdana.com/file/61202150796.pdfIn PDF document text
- http://flyingkirin.com/uploadfiles/file/100428266677.pdfIn PDF document text
- https://migger.dk/userimages/file/wisabojawitigivenikitojip.pdfIn PDF document text
- https://novzelandiya.ru/ckfinder/userfiles/files/34919085096.pdfIn PDF document text
- http://bjaimama.com/data/upload/2021/07/file/202107051217083567.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/kobexoxileraleruforebabu.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106657115898---35092728817.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc40cd29466---firuxutedaseterexezuvep.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe9c502471b6fd183e16146f94f1adf0/jekolu.pdfIn PDF document text
- http://sladkiy-ostrov.ru/userfiles/files/webufo.pdfIn PDF document text
- https://autoandtruckrepair.net/nbloom/fckuploads/file/48206761198.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6fe60c99cf48a466b033a20f31a6d94c/76735830966.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_off0000db12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF324	16776 bytes
SHA-256: `66e00d4efe0ed4f1715084797cdf71f5c5a2ac04e1748bff825914f37183d80f`
`font_02_sfnt_off00011ea4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EA4	10620 bytes
SHA-256: `c8dbee002ca7fae69555da374eceebb63ca4325b1cb1879ee1635d957fce2389`

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