PDF malware analysis — malicious · c1e091d0382586fe

MALICIOUS

PDF

92.7 KB Created: 2021-09-20 22:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 0f3e6e70a7de963495aa345648eab1aa SHA-1: 619be92e76c53fa880cc4ff085bdc0a5f830c9ab SHA-256: c1e091d0382586fe70179b7ff2ebdab1681300805ba319904efec9e10726097f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are used for SEO manipulation or to distribute further content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9600

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 http://beauty214.com/uploads/files/202109110753137603.pdf In PDF document text
- http://toyotacri.com/userfiles/files/25304014589.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a383502f5---16985969116.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466d3f5569b---18128768645.pdfIn PDF document text
- http://mansiya.com/uploadfile/files/lotefatizot.pdfIn PDF document text
- https://wic-net.com/userfiles/file/futemusudoz.pdfIn PDF document text
- https://lompatjauh.com/contents/files/70407481238.pdfIn PDF document text
- http://inbjnews.com/data/cheditor/0603/files/gitoxarira.pdfIn PDF document text
- https://incoyun.com/calisma2/files/uploads/sotom.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/76517859137.pdfIn PDF document text
- https://vibangthuaphatlai.net/uploads/files/85968938106.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/82f0dddc0a834aae35e51b579dfe0c18/tutopuzirebarunudupos.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/wafegemedusatek.pdfIn PDF document text
- https://emenu.hu/editor_up/32959838437.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8280f73c7c72c356b56832f8b210c3c/zukipafebinuvelomoguga.pdfIn PDF document text
- http://metallpress.ru/files/valeber.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613731e2afd46---nufexow.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/80154786085.pdfIn PDF document text
- https://vntdc.com/upload/fck/file/pozexulenalore.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4fa91318---xupewamafawonab.pdfIn PDF document text
- http://dobrejaja.com/Upload/file/tiwaxotatejofoxifaladixi.pdfIn PDF document text
- https://rosycaffe.com/file/10575844809.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fe62ae82---zafowa.pdfIn PDF document text
- http://wish-pharma.com/upload/files/zutidozukozijemugeva.pdfIn PDF document text
- http://www.coverseg.com/uploads/ckfinder/files/zivuvilumovugojuxemuxad.pdfIn PDF document text
- http://generaltubi.com/container/ckfiles/files/jodejolulobexawowud.pdfIn PDF document text
- http://back2wood.de/userfiles/file/witupixonemum.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=photoshop+tutorials+pdf+sinhalaPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dab4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAB4	23012 bytes
SHA-256: `cc5e5187863236699f0cd022bbe767c2e622266416af1b625939e828fe35bdaa`
`font_01_sfnt_off0001157a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1157A	16180 bytes
SHA-256: `c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f`
`font_02_sfnt_off00012b1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B1A	1804 bytes
SHA-256: `3e0df04775994f06af00dd43b182878e5699af55e11d9568351e5f77a1858c75`
`font_03_sfnt_off000133a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00014bb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BB8	10564 bytes
SHA-256: `3eaa4b0198b9f2ec6a6e9def0472ea0ca83ad82dd7cd913a2e6b68e75dfed412`

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