PDF malware analysis — malicious · fbb927ea310bce27

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 02:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: fa4d0856e1a73f355b3be13f3a7187b8 SHA-1: 8e89dea9a092a3937787e8b51f7d02f388ded05f SHA-256: fbb927ea310bce27f4f454d48627f824b9b6d70ce6cc7d47a4679b8b42028bd5

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and potentially compromised content management systems. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 7

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.
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://smidgel.ru/uplcv?utm_term=honor+play+security+update PDF link annotation
- http://sz-nuoyi.com/Upload/file/2021090303321527104.pdfIn PDF document text
- http://sevenseahotel.com/uploads/images/files/79921259796.pdfIn PDF document text
- http://101balkon.ru/upload/files/xoramo.pdfIn PDF document text
- http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/5981083533.pdfIn PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109100837161079.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8492dcc30---8989306375.pdfIn PDF document text
- http://www.startservis.sk/novy/ckfinder/userfiles/files/98436647469.pdfIn PDF document text
- https://0922.sproname.com/files/userfiles/files/98938221821.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323afb85943---2442705151.pdfIn PDF document text
- https://mvmdigital.gr/files/files/zuzusavululegivopakogozol.pdfIn PDF document text
- https://szaniterplaza.hu/ckfinder/userfiles/files/tinaxu.pdfIn PDF document text
- http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/woririfijigimipulo.pdfIn PDF document text
- http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/6957800403.pdfIn PDF document text
- http://erpsamik.com/ckfinder/userfiles/files/42982079436.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28b4dfea9---varojozamoredowibi.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/57960912509.pdfIn PDF document text
- http://cellesekorea.com/ckupload/files/wegenumefuzesogexebolose.pdfIn PDF document text
- http://turksebruiloften.nl/userfiles/file/bakimuvedoxawewetuzo.pdfIn PDF document text
- https://edenestates.com/ckfinder/userfiles/files/pifegizatikeziridowanavep.pdfIn PDF document text
- https://medsplus.us/admin/images/file/lusurupukijoxagozir.pdfIn PDF document text
- http://indianspringhomes.net/userfiles/files/waleresavazul.pdfIn PDF document text
- https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/6219058151.pdfIn PDF document text
- http://perfecturology.cafe24.com/upload/editor/imagefile/vomijisenekoduw.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_off0000d77c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD77C	10712 bytes
SHA-256: `c836a50a11aa8714a314c8f09ec33360c8165ec0c3368483678e9b2f10e74e33`
`font_01_sfnt_off0000f029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF029	18304 bytes
SHA-256: `e3b78e3ba837bcb1e37040d4d78e8d481bdd273a1e40fb0fcc373e2672b3c3b5`
`font_02_sfnt_off00011fd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FD7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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