PDF malware analysis — malicious · f4d947098c35d3f0

MALICIOUS

PDF

88.8 KB Created: 2021-07-09 08:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: cb1d724e5044b314da849159caa4cbd9 SHA-1: 81a9136c6e2afdeba2d2bb8caa48cf82dee8910b SHA-256: f4d947098c35d3f0ae85ac41fdcd6e0fd320b3cb1e120cb368b141c745b4c759

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, including those associated with compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=word+equation+for+the+decomposition+of+calcium+carbonate PDF link annotation
- http://toonesk.com/upload/50504038622.pdfIn PDF document text
- https://kozhikodedeaf.org/admin/my_files/file/gijovedosojona.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094e37ad0847---42933876031.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0e605c9386479d754d7d034c0c669989/dobowenapipapururudu.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/co072lkac5uuf28u9snaoav4el/latefuxulokoje.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/53913393356.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3efd9ee5---49019094322.pdfIn PDF document text
- https://icbacademy.com/upload/files/megonezazemanawabuwaz.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f059a8d75---22959164469.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080140648d68---palumolamotasabamug.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/rirezuk.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607630da314f0---lunagurarinowasa.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f64ea5e43a95fc35cfb71b58a5428ac4/43128772741.pdfIn PDF document text
- http://hayatteknoloji.com/webimage/file/kenupazeza.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609350bca19bf---90284374777.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_off0000f889.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF889	16764 bytes
SHA-256: `de760e3bf3a730f49b57cbdda62f38ac8fbf501253e14a6b91e62bc52d4044db`
`font_01_sfnt_off0001242b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242B	11264 bytes
SHA-256: `a349d6f4e99a0443e4ef42c7d079495fba536cefa9425b6f65ab7ea83cbb48b5`
`font_02_sfnt_off00013df3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DF3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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