PDF malware analysis — malicious · e75cdbd0641f3481

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 03:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4a7d9f46c0f949785bf5a86fcd1ce347 SHA-1: 66ecaa35232482da8c3e8eaddf1da5922c09a423 SHA-256: e75cdbd0641f3481955dd3dafd9860429f0be133b5d17c9a1a38860df55769f7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=premiere+pro+cc+2017+shortcuts+pdf PDF link annotation
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126f60e62ea9---56676119759.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/86083031074.pdfIn PDF document text
- https://bursac.net/userfiles/file/29123156223.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/fuzevukejin.pdfIn PDF document text
- http://champaigncursillo.com/userfiles/file/pozolurenoworexodavoxaj.pdfIn PDF document text
- http://cutencuddlybreedables.com/_images/file/wuwemoxivojav.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2d791e6ff3823c02c0e9497ad91a9afb/60531926388.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/64485107609.pdfIn PDF document text
- https://bookatowncar.com/userfiles/file/robifijirujegowot.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b272dbef---gifujakad.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cf73cd087---gipuwuxuvoxi.pdfIn PDF document text
- http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokup.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/tuzefomumiwabapur.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee9058475---64432862811.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/de8929855d39c1c4bb4aa70b5cb92786/41995785376.pdfIn PDF document text
- http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/94904031535.pdfIn PDF document text
- https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/94477188494.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f792a3e7b55491d5e698eda3104594b1/58910840.pdfIn PDF document text
- https://rocksoliddesigns.biz/userfiles/file/lowani.pdfIn PDF document text
- http://activesolutionelectric.com/images/file/xuzuniponu.pdfIn PDF document text
- http://naturpix.ch/cmsimages/file/76698460933.pdfIn PDF document text
- http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88877178774.pdfIn PDF document text
- https://tolgyesvolgy.hu/userfiles/file/98876455727.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_off0000de7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE7E	17848 bytes
SHA-256: `40484dc1decca7bda15f70873dec0f7b06dad8e47be54f8c741b6178d10b7565`
`font_01_sfnt_off00010cdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDF	11020 bytes
SHA-256: `a885cee537c8a91cf47a5ef006ed7f7f1a8f63fdf35c16f3dd0cf90fa0fa3014`
`font_02_sfnt_off0001269e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1269E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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