PDF malware analysis — malicious · 879c4c4357fecc1a

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 23:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a67aa479033dd20df573a0e5ba05db78 SHA-1: f21dcf87b5efa2a1eb065c3e020b4c7b515910ae SHA-256: 879c4c4357fecc1ae41cebe2593300e364de14e61c1449768a04d13a9999c51f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9430

Heuristics 5

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
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.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885ec5cfa4---91963337747.pdf In PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d699e077---netuw.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ob2l1fd97v4mo3s7f24vuok5dv/21427818665.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b1db82f34a10b6994a87867028045859/9716164116.pdfIn PDF document text
- https://emenu.hu/editor_up/76145775982.pdfIn PDF document text
- http://bright-inter.com/file_media/file_image/file/gelinawejabanekelukiki.pdfIn PDF document text
- http://svaz-podnikani.cz/files/file/xinidimotomigenijemad.pdfIn PDF document text
- https://harkakotony.hu/UserFiles/file/busififef.pdfIn PDF document text
- http://poetryforthespirit.com/clients/872464/File/71405207918.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb91bc6fbe124b24b3f15f827effb74c/moforixep.pdfIn PDF document text
- https://marljivo.hr/userfiles/file/piresomewera.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b05f27e51---xuduwinumu.pdfIn PDF document text
- http://bookblog.kr/data/file/files/347944263.pdfIn PDF document text
- https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/xojizagerisowoboxezag.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8ff3a3ec30f36a4a7a558075197a918d/70189968160.pdfIn PDF document text
- https://sankaibearing.com/userfiles/files/jebesurulu.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e419fde8bc2b575539c56f023b5a880d/danadaw.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160971e0eea8bd---88737342785.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/60641999264.pdfIn PDF document text
- https://ddtoyz.com/ckfinder/userfiles/files/wimejexogaketotade.pdfIn PDF document text
- http://vigova.vn/Images_upload/files/66696439042.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a3c793ecc19d3e123828090363252d7c/46142220220.pdfIn PDF document text
- http://nowator-zpu.pl/userfiles/file/xawaxujijixadumofiloruku.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uta+biology+degree+plan+2016+pdfPDF link annotation
- 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_off0000edcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDCD	18144 bytes
SHA-256: `3d8c09293029c4f0fdf723073f7156ad410430c4474a37694e33205b4e60c600`
`font_01_sfnt_off00011cdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CDB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000134f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134F2	11228 bytes
SHA-256: `a0917ba80b2e87d243e678e5dff770ce8c76af6dc3737d826e2aeea2e0e770d6`

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