PDF malware analysis — malicious · c4318f0232e5bb67

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 06:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 376ef41b55f31e68a850b23eab3806a8 SHA-1: 91cde761abe845bd7fd4f32116af12abbb48fcce SHA-256: c4318f0232e5bb673eb91ac1eeba5afcdac41ea6e41828bfe5e7651ae7e2fd3a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious content. The presence of embedded URLs suggests an attempt to lure users to external sites for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=paronyms+examples+in+english PDF link annotation
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedfd8f4b0---38415285842.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071677ade206---12928787571.pdfIn PDF document text
- https://energooptima.hu/upload/File/32385138584.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb45651fc4---xogutaweret.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ee109367eab9157652559e0ec7e055f/94674266148.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/da9b8c976f7d39417361ee6e208a9a31/kemisobupo.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078e923843c7---fekaronatuzulomamed.pdfIn PDF document text
- https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/d6e75eb1232e3c8df18ee156a815d991/xikutoxipiwu.pdfIn PDF document text
- https://paperland.bg/uploads/file/66162536175.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07b8b4769---suvawabinivitopimi.pdfIn PDF document text
- http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/17453246080.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rmlthtg8sbpq7n4n1jjcd2uvto/59146091014.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc09858d7f---76173217722.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bff6fa15550a3d950639e3451017f002/78619156375.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/738075ed6538187fd2ff9b6b13926f61/selesulajuvaferet.pdfIn PDF document text
- https://angelsstaff.com/uploads/file/fininenipumozip.pdfIn PDF document text
- http://nelly-design.ru/upload/files/69493168802.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070885a58e3c---suzedom.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c2b3b87---latowemor.pdfIn PDF document text
- http://phuwangnam.com/user_file/file/vaburemeji.pdfIn PDF document text
- https://dnsbp.com/all4help/fckuserfiles/file/3928182563.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17e979083---13962315318.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbe470c77---82331409115.pdfIn PDF document text
- https://dansobentre.net/uploads/file/dosus.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/01fae9c3881bbcb41eaa1924a8b0c605/94057164233.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/bueqihk7sgpijqmjl6ptoo38na/gutoguxumaxil.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_off0000f97d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97D	10816 bytes
SHA-256: `9192588d767fef4b2ee98ed25d736ed90f319e22c909e38077e763e47a9ba54a`
`font_01_sfnt_off00011239.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11239	17132 bytes
SHA-256: `b39de726a2bf7600a0256f123ca8f5ace895175ca4e35a28d639c1038fb3ea84`
`font_02_sfnt_off00013e5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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