PDF malware analysis — malicious · e7f42adcdeb9e839

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 22:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f6d503705052373e85687f2aafdb7eff SHA-1: 9fe9f138877ad8fbc449ac9b8f3b03301c6e22bf SHA-256: e7f42adcdeb9e8393e35545d56054ad20bca918f7d260a200966001432c3a611

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=caracteristicas+de+los+sistemas+operativos+android PDF link annotation
- http://www.culturehousesun.org/photos/file/muvuturajotafekuxax.pdfIn PDF document text
- https://maryamghiasi.com/images/upload/files/kozutokaxule.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376532ef98d---nusamilipewisoxalujuf.pdfIn PDF document text
- http://mondoacquapiscine.com/userfiles/files/38354587812.pdfIn PDF document text
- http://www.w.radeton.cz/ckfinder/userfiles/files/35670595217.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fc6f476---52555299524.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/xamoto.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617cf87eaf---ziledaju.pdfIn PDF document text
- https://ldcpc.com/ckfinder/userfiles/files/nogudobujexi.pdfIn PDF document text
- http://pacemakerpressintl.com/uploads/assets/file/rowux.pdfIn PDF document text
- http://nokianhakkablue.ru/ckfinder/userfiles/files/katuxaradizanum.pdfIn PDF document text
- https://iieng.org/editor/ckfinder/userfiles/files/kekatipo.pdfIn PDF document text
- https://segurodegranizo.ar/noticias/fckeditor/file/20267746903.pdfIn PDF document text
- http://www.oomedia.com.tw/ckfinder/userfiles/files/numij.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acba9f1f1a---kapalatozepebidof.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/8950633953.pdfIn PDF document text
- https://izometal.net/mm/file/55041728761.pdfIn PDF document text
- http://thehedgerowchronicles.com/ckfinder/userfiles/files/fanafudigogekaxite.pdfIn PDF document text
- http://chaitraglaze.com/uploads/juminovaxakogedimav.pdfIn PDF document text
- http://kajo-frings.de/userfiles/file/xumexu.pdfIn PDF document text
- http://printrun.nl/userfiles/files/ridanadozuvivusular.pdfIn PDF document text
- http://theeultimatenetworker.com/ckfinder/userfiles/files/zijaxagipolopuma.pdfIn PDF document text
- http://photou.cc/ckfinder/userfiles/files/bupojunaxovufamodenusinel.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.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_off0000e62d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE62D	10772 bytes
SHA-256: `5944ad589edcf2ea2000e4d4b60d7d10247cf62faaded1e1745c2063c72b3ef1`
`font_01_sfnt_off0000fefe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011710.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11710	18764 bytes
SHA-256: `15d766868af6f491d824da0b7346fdc4b104e129b9ca8d22af9820f56924d49b`

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