PDF malware analysis — malicious · 27a3f28f27d77396

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 11:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 503b3665d193f6e3a12f7b3077ece28d SHA-1: 1d112fdd862dc65e4cd5412db7dfdadad68e2884 SHA-256: 27a3f28f27d773966a9908240903f8b62d300ecc7c38bb0cab7c86cb4f57dfde

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream, which is a common technique for executing malicious code. The document also features a large number of external URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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=manual+transmission+driving+lessons+dallas PDF link annotation
- http://morethancars.nl/uploads/edytor/file/bugonafo.pdfIn PDF document text
- http://hiddenroots.org/clients/19739/File/44428913314.pdfIn PDF document text
- http://aldobini.it/userfiles/files/wukukegesewowofage.pdfIn PDF document text
- https://gotoko.com/cmsv2/upload/files/15257673624.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5e2cc53e0c69d343957f436793363411/wexedowafupaninuro.pdfIn PDF document text
- http://dxqzx.com/ckfinder/userfiles/files/20210624_105752.pdfIn PDF document text
- https://jordanadams.com/ckfinder/userfiles/files/ximovudifujosakalop.pdfIn PDF document text
- http://aptchasers.com/FCKeditor/userfiles/file/14860991008.pdfIn PDF document text
- https://ajur.rest/uploads/userfiles/file/wubonojedawagusojej.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c1d134b0---47886224571.pdfIn PDF document text
- https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/pogafazepagunenajuxo.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/752e07a8463c4c112f2dcb885b303020/51639873500.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c95b8549df92816d347af2787492445b/69950148834.pdfIn PDF document text
- http://edwardnugent.com/userfiles/files/sutiwejisinesixu.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/18363c4d43d489b6b2a066c1562fc457/42221068264.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d527e100e8---wedaviselenuwinuwujimo.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/eafd5096df5e62db45f284ead7d5d27f/kebikapapi.pdfIn PDF document text
- http://saopauloairporttransfers.com/ckfinder/userfiles/files/86751445218.pdfIn PDF document text
- http://galluccifaibano.it/userfiles/file/53404978906.pdfIn PDF document text
- http://herningbadintra.dk/app/webroot/upload/files/jotoxinetuporewalokovuxo.pdfIn PDF document text
- http://arcdesantmarti.com/biocop/Images/images-editor/file/5122611008.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/7530232484.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_off0000be62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE62	17004 bytes
SHA-256: `8d5f184e2320700376ec8df9f82c1ca4061c416dd2f506004f79ff87f7fc4601`
`font_01_sfnt_off0000ea8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA8B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000102a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A2	10748 bytes
SHA-256: `c338e12ad36ca851012dad613e184e1723073ef984d1ebb373953d3ab019d8ab`

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