PDF malware analysis — malicious · e92e17fda9f23bbe

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 23:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 087d6379d1c0fb050c249aa79dde0b54 SHA-1: 0f108aa5bb1a67381924d4fcc206c0e358e21526 SHA-256: e92e17fda9f23bbed69254d9b7bbbc76d79940f3c00d85cdcb0fabda434fb2f3

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to various domains, including compromised CMS uploads. The document body is heavily obfuscated, but the presence of embedded URLs and the callback lure heuristic strongly suggest an attempt to trick the user into initiating contact for fraudulent purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=water+and+its+treatment+engineering+chemistry+notes PDF link annotation
- http://avs-market.ru/admin/ckfinder/userfiles/files/93420519084.pdfIn PDF document text
- http://magic-mugs-factory.com/uploadfile/files/4440442826.pdfIn PDF document text
- http://cl-pub.com/files/files/44583138081.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/fuvezodovoxakud.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/binivitad.pdfIn PDF document text
- https://ispartaprefabrik.com/ckfinder/upload/files/tixufofewojidetomid.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8593l5kdgssuk6aeblbli6s5v2/30049550588.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/voguwutanejogetupanovofa.pdfIn PDF document text
- http://energy-labels.com/userfiles/file/76603578661.pdfIn PDF document text
- https://fuoriscena.eu/file/37779760936.pdfIn PDF document text
- https://gberwanda.com/gbe/useruploads/blogs/files/dupatoradosisawomipupumo.pdfIn PDF document text
- https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dubomi.pdfIn PDF document text
- http://virtualcharityevents.com/vce_cake/files/files/18403277125.pdfIn PDF document text
- https://flardochform.se/userfiles/file/pasakuza.pdfIn PDF document text
- https://indirimlipin.com/calisma2/files/uploads/sijiwodolekoretowegumosi.pdfIn PDF document text
- http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/14806260331.pdfIn PDF document text
- https://cplastik.com/data/cms/file/98536596334.pdfIn PDF document text
- http://atrsara.ir/resource/files/fugudidekalit.pdfIn PDF document text
- https://soccerauquebec.com/userfiles/file/jufaf.pdfIn PDF document text
- https://blueparadise.pl/userfiles/file/wejalutuwumepepiru.pdfIn PDF document text
- https://barcelonacentromedico.es/files/galeria/files/begotudelovanilaxipesadug.pdfIn PDF document text
- http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb04d62110549f9f4fc329d7ea7be530/xaxalunogogepuwu.pdfIn PDF document text
- http://silverk.ru/img/lib/file/letesad.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141752674024---dafifulasu.pdfIn PDF document text
- https://www.rt9.rspo.org/ckfinder/userfiles/files/25645235779.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_off0000b5dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cdee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDEE	15976 bytes
SHA-256: `6f1a174704796b77cb10c5569480b4a8a732716c8261bbd9e5404b8df13707c7`
`font_02_sfnt_off0000f66d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66D	10876 bytes
SHA-256: `5ff88c7d95c2be2ff86ca8c6c61cc4cf472402fff15ac7159aa29e8fa859c0a3`

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