PDF malware analysis — malicious · 6a8b160f55df08dc

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 08:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 32742a2b4732e1774bd9119b2fa919ec SHA-1: df78d5d39b42e67918314174efc596f78ae47c8f SHA-256: 6a8b160f55df08dcb17f3c3019aaad566969fb6cda00ea3cca7d377c7d00132c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware. The presence of external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://salvamontbihor.ro/app/webroot/files/userfiles/files/27331786764.pdf In PDF document text
- http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/1048157949.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/db282b9907ae45a8066401d9cea46b8c/ligumulisegiweti.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/botajizexelevowunevovod.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/vulawoda.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01ed08e55---wipudesetuzokebakekuxilev.pdfIn PDF document text
- http://lafayetteconnections.com/clients/52818/File/55713256242.pdfIn PDF document text
- https://egca.fr/userfiles/file/vidipasagowedilakopufufo.pdfIn PDF document text
- http://technology-mp.it/userfiles/files/19695248985.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/96338514496.pdfIn PDF document text
- http://mlsy.cz/images/file/files/41510226489.pdfIn PDF document text
- http://archinfo.ru/uploads/file/jifas.pdfIn PDF document text
- http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/5074483545.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fdd01dfb1---fuvewapevima.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9chmiv3sk79f55j6tlbvrmmigj/28539661740.pdfIn PDF document text
- http://poongdung.com/FileData/ckfinder/files/20210715_3F608975F27D7243.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/avl1v5f8rmgcqlv0lsnkuqm676/mebixuvavepadulabijakilez.pdfIn PDF document text
- https://textosolutionslinguistiques.ca/upload/editor/file/86935630546.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/sefujefojijanodu.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/wepipuwem.pdfIn PDF document text
- https://goodline.by/userfiles/file/koxafot.pdfIn PDF document text
- https://tenfci.org/userfiles/file/94638123158.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f037b8cd67---daduzovukofaxur.pdfIn PDF document text
- http://www.mediagrand.hu//data/editorfile/bigovonuzomazevi.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ce7221f193414a0e6bcf8650113175a2/balopoxurepipimoxu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bachelor+of+computer+science+subjectsPDF 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_off0000e94d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE94D	17272 bytes
SHA-256: `de47af10764745c665fbd07e39c23934c750a94e59019519af5070850875b0cf`
`font_01_sfnt_off000115de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115DE	11168 bytes
SHA-256: `06d0ee359148b4cab3feec27ad756c13115f715dd166a04f1f03c00f885f6e6b`
`font_02_sfnt_off00012f95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F95	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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