PDF malware analysis — malicious · 8658594e4bf90496

MALICIOUS

PDF

119.2 KB Created: 2021-09-03 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6fce8b9dee424c1fd101f8ebdb374f71 SHA-1: a0f5613111d9359c5b9f63f420ee1be9ead29aa2 SHA-256: 8658594e4bf904969b75670f4d8fbd4d3f228e6b8fc1d1cd657daf74aa5a1971

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=robert+walpole+pdf PDF link annotation
- http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/27656764003.pdfIn PDF document text
- https://virker-ikke.dk/files/77718959864.pdfIn PDF document text
- http://actybrain-consult.com/Upload/files/zexovaluzojajuwovop.pdfIn PDF document text
- http://wonikqnc.com/upload/editor/file/1622241831.pdfIn PDF document text
- http://se-ty.ru/uploads/userfiles/file/zanigan.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qj2ru17uno07nhitpvi8g3vgfp/3045408715.pdfIn PDF document text
- https://www.winsum.frl/ckfinder/userfiles/files/26861446739.pdfIn PDF document text
- http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/giwagizog.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2e47dd7ba007e8a8bd30647f7dccd223/23933643613.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad1a7f901---womap.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d94113173---8468535497.pdfIn PDF document text
- http://brain-sh.tw/upload/file/rijutenibetegaxupepepi.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/bopebil.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/968114033d733e18fc8051b95d9b8c84/jemefofugejubolagas.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/62ecfc89606fdf99b3faf50fdac657fd/39992956672.pdfIn PDF document text
- https://beautyyaurient.com/editor_upload/file/28559871160.pdfIn PDF document text
- http://maschimaurizio.it/userfiles/files/9120778789.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f9cafb50---wowebafizim.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/397fb8ed8f03102932883831720a343a/pawozatugixabuw.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210614110659_j2g36h.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dk3gu209ehb9fgmfml046jblp4/30430970286.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/sebitosojev.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_off00016ee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16EE1	18724 bytes
SHA-256: `2832b202e8483c309774d95ba982eac4680e3031aa5e857aa77db369c553a1f9`
`font_01_sfnt_off00019f64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19F64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001b77b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B77B	10400 bytes
SHA-256: `8855107ea14f4adc946125eaa9ca28191589e3328d5ccf2c436b3d3d455c6cd4`

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