PDF malware analysis — malicious · 578ed799b5b674bc

MALICIOUS

PDF

88.3 KB Created: 2021-07-18 02:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: dda6bd340325d749dc6c25a5f32f9c85 SHA-1: 28eb9eb8ace8960c0e0ccb761090f1e38a23e046 SHA-256: 578ed799b5b674bc7694abb3f2f45eeed960683ac9387ca17412b4a8537880bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

Heuristics 6

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
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://chemasan.lu/userfiles/files/guxekebupuwoniwivi.pdf In PDF document text
- http://svaz-podnikani.cz/files/file/radanirasugalodo.pdfIn PDF document text
- https://etadelloro.it/images/file/kulixapuwogoj.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1c4a45f3---duviwokululi.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a261819e4613b690d33c77e4d329e2d5/veraziwu.pdfIn PDF document text
- https://stvorki.ru/files/file/bujuruwefuropot.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73c1a53e8---31899567635.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/2a6b2ed34b75a7ba0cdcb1542c1ee9e1/53587719745.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc7fc9b66---birigulezajiwun.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608388027c4d5---zogigifovaxebomibafigar.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7f6c5dc68af7fa68a5781bb10718e176/xarugalo.pdfIn PDF document text
- https://peintures-descours.fr/fichier/files/84210395768.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea68ecb00---86227895030.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/15aba908cd3b01ec712cfc2279ef2e13/38388250776.pdfIn PDF document text
- https://lolakarimova.uz/ckfinder/userfiles/files/43713164041.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16078b75c6fd32---nudijurutekavuvowakev.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd23f67284---54225928716.pdfIn PDF document text
- http://geriatriccarenewjersey.com/userfiles/files/45569524683.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a71d57c63fb8c44d8cc2c62d15fea2b7/xegedigofowe.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b0e5cef5---tobufegemedapativeb.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ef27039e---zubimewifet.pdfIn PDF document text
- http://littlepearlspublishing.in/data/eimages/file/turuvoleki.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae5990ef7---65146629314.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f207cd517---sekifetomonipip.pdfIn PDF document text
- http://goldway.jp/upload/board/file/26088815921.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7913ff1f4a---birugir.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=editor+letter+format+class+10PDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f635.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF635	10688 bytes
SHA-256: `26268e7035b4e0e161e3312702407bb3032e488c7e2c32290cdd2a1440e65344`
`font_01_sfnt_off00010ebf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126D1	17216 bytes
SHA-256: `855c8c9d65c53a6f341e1fac401593f8d76af1cecefdacc4a581dad65f6f8448`

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