PDF malware analysis — malicious · 732c55a7b2ad576b

MALICIOUS

PDF

90.2 KB Created: 2021-07-07 22:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: cfe4e4fbe7e9f4203317c83042287ef3 SHA-1: bf737d367cb6188deea83d646ad4f41928a9745a SHA-256: 732c55a7b2ad576b8fa0a8cc83bd1e3cabc19a3cb4c1e49e877eb309b37a2994

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The file's structure and numerous external links suggest it's part of a campaign to redirect users to malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/uplcv?utm_term=how+to+save+an+excel+sheet+as+a+pdf PDF link annotation
- http://jfac.kr/ckfinder/userfiles/files/janezuxukebififezivi.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hq2v4sccfv74i10t54pruqkhal/pametup.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811bbfbf83a---zigimekijofujuzuretifop.pdfIn PDF document text
- https://daismene.it/file/lekaxudevukuvanamusunadal.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e2970b5fddaf5438e53ac05116cd9e4/29966860531.pdfIn PDF document text
- http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujog.pdfIn PDF document text
- http://gancza.pl/userfiles/file/xufirasigu.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/11698378805a7b46eadb4be993eef400/nipokubobukog.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbe27be23---92076829350.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879783505---piwitekogilumafakitora.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328fb86acb---velipekomuxizazagipawebit.pdfIn PDF document text
- http://camionespanamericana.com/userfiles/file/togemazirerudebukikitome.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a449tm9o9o68f06ianhichn3h/82640277471.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e87d3d54ee58a9cda372256c6b5efdef/xusugedaru.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788a18a934f---23567521743.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/51789704407.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a2049d8fe8bbbb317474a99b05a1a7d3/41068318590.pdfIn PDF document text
- https://unserbiokorb.ch/userfiles/file/menefaloxogijow.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ce3d859b---86035110047.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bjs6ad57vsgnps9lsh0rhhur2f/fugonusopitizijedufivone.pdfIn PDF document text
- http://internationalnetworksolutions.net/files/29990270543.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/23a15c37ce6050b599f424aa4440f260/8888444924.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45186d07fb---vigawurututafilatej.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7994ee822e---18625323881.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/bilivegewapawagudo.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c787514090b---gesipirixevuvugubux.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_off0000fd57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD57	17180 bytes
SHA-256: `27073f233c1da2812bd7702d494d36a501e5c0dadd445047a84e5a4ab741f603`
`font_01_sfnt_off00012a82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A82	10772 bytes
SHA-256: `224970ee4ce9f93198d80406f67e761331b3b5d31a54e60551dee26667c9c91c`
`font_02_sfnt_off0001434d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1434D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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