PDF malware analysis — malicious · 2403b30f1eaca3df

MALICIOUS

PDF

92.4 KB Created: 2021-08-24 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: aabcd59f60d71cef771514496b9cdb92 SHA-1: 95b2c0844c962c15e40a897b063c1ea5875efbad SHA-256: 2403b30f1eaca3dffc4bf95bda4de93880014e64ecdcd60b4e529aac716badeb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=spawn+helicopter+gta+5+pc', likely serve as lures for phishing or to distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=spawn+helicopter+gta+5+pc PDF link annotation
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cf1b66442e58970a3aae47b89fe6715/vazasitowagatolewabap.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/30865826270.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac283b9da0---81915489705.pdfIn PDF document text
- http://rauvuonsach.net/images/uploads/files/13671393990.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5d96017d55bf6edb025957a2c04aaad9/565751948.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/12837828711.pdfIn PDF document text
- https://gs-hemeringen.de/ablage/userfiles/files/zakobeb.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db12e1e46---26332088478.pdfIn PDF document text
- https://idea-web.ro/app/webroot/files/userfiles/files/89567551421.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/65ef8c02f2e51d5ba29c386e21f233aa/xodazuxazokawopuzabapa.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac80dcc054d2e696f4a8dd7f896c6258/xuwodufugesexuvemisag.pdfIn PDF document text
- http://connectcontrol.net/files/userfiles/files/20367572595.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/vamukajos.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/wezenomagivuxuj.pdfIn PDF document text
- https://bodegoncriollo.com/userfiles/file/nokubilugovunodafafilexet.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tjkj34s2bi57jti7onucqmfr26/bolaxinovusalotef.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110648538858---21030974094.pdfIn PDF document text
- http://machulski.com/public/file/61076725897.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/63605697302.pdfIn PDF document text
- http://oasis-inwaste.asia/files/file/lazesatesok.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7bc6f0924e9fa065d748f11def143698/68227787447.pdfIn PDF document text
- http://jacsonsfurniture.com/userfiles/file/muxukalezet.pdfIn PDF document text
- https://ymvii.com/admin/upload/files/69060339087.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a6ef4496df1f9f1261664035c4d94d51/wuxazatenaj.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e126cfc9d5fac5b871fbc3cd7d423814/jofarali.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE67	17676 bytes
SHA-256: `0f52e9139d4fcdbbf285ff4a33ca18d3c06f1a3fc51afd21c1174c12bc4fead7`
`font_01_sfnt_off00011c74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C74	10780 bytes
SHA-256: `1eba2003438ef14d6e24db0307d6f43a6866c447aba20ec3ee201d09a9f752df`
`font_02_sfnt_off00013553.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13553	16160 bytes
SHA-256: `a7763f86a92ccb45038d25cf331484ef381d63b8f3709f887815353db3a51942`
`font_03_sfnt_off00014ae1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14AE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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