PDF malware analysis — malicious · 5ed66450c8429e43

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 21:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 498b9d8a3146270d2838aae22d19c61c SHA-1: f7d56c958e3ec761f8018e175a6bfb8c52365d7c SHA-256: 5ed66450c8429e430ed2dcdf7d421bda87abd1c376969384bc84bbb450790529

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, strongly suggests a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts users to call a number, a common tactic in tech-support scams or refund/billing fraud lures. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://krisoc.ru/uplcv?utm_term=uk+used+iphone+xr+256gb+price+in+nigeria PDF link annotation
- https://hankilfood.com/upfile/files/bifiposixutipupomeragudox.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40cc99c7d---zavivivozupakizok.pdfIn PDF document text
- http://sostrevalli.it/userfiles/files/revusigijetezivetipabu.pdfIn PDF document text
- http://madiran-cruduparadis.fr/ckfinder/userfiles/files/31405714216.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/698348608ad1eb1f0e7a5bd8090e911e/37941815855.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/lirasowozi.pdfIn PDF document text
- http://jmk.kr/ckfinder/userfiles/files/vikukewerivexabesosiwemo.pdfIn PDF document text
- http://lor-rostov.su/userfiles/files/1143089190.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/37643936540.pdfIn PDF document text
- http://446888.top/userfiles/file/80598659225.pdfIn PDF document text
- http://studiopol.com/userfiles/files/27098070941.pdfIn PDF document text
- http://gtlmarinefuel.com/userfiles/file/9560236466.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/fijazitezutewagufaxipezug.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11a6c06ad---fewikafes.pdfIn PDF document text
- https://www.nitdgp.ac.in/uploads/userfiles/files/tejifitalozamo.pdfIn PDF document text
- https://itracmediav5.com/ckfinder/userfiles/files/99608591984.pdfIn PDF document text
- https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613761336ee70---971907462.pdfIn PDF document text
- http://pop-around.com/file_media/file_image/file/1955246480.pdfIn PDF document text
- http://gurolmumcu.com/userfiles/file/74724914331.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/457040290613f67228423c.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9e3caa1c7bc44d4e59a8ce8ae16611aa/bugik.pdfIn PDF document text
- http://80tner.friend-match.com/upload/files/40868824968.pdfIn PDF document text
- http://topflexsports.com/uploads/36824610001.pdfIn PDF document text
- http://tdvvietnam.vn/webroot/img/files/39280120520.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_off0000e44f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE44F	17592 bytes
SHA-256: `44cb74016763bb592285f854aa357b3413fe86e19e2154c303bc621934d519e7`
`font_01_sfnt_off00011170.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11170	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012987.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12987	11512 bytes
SHA-256: `1e7b35f31d6fd34122e40b535016a863ffc0f0a99fea75fbcbf1fd8c99bae0a6`

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