PDF malware analysis — malicious · e4d682fdec55fd1a

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 10:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 13b96e604a8660323f0130dc557e85cc SHA-1: 8bfd9f9de5f6212bea33de83c37ac14120ceb5ad SHA-256: e4d682fdec55fd1a518631ffb75a73da6e05ee83b1e74b14c0a0d7de11f878b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload storage suggests an attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9323

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://medvor.ru/uplcv?utm_term=adorning+meaning+in+english PDF link annotation
- http://wsp.pl/userfiles/file/1326883937.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/7299557689.pdfIn PDF document text
- http://chaitraglaze.com/uploads/fofawolozizakesijiriko.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/10635500506.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fp8aqea3a1fa5puhuqlp62735v/22027746020.pdfIn PDF document text
- http://bugaboo-buffalo.eu/UserFiles/File/putekito.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/5ef9827c746454e83e605a55816f5020/65489661137.pdfIn PDF document text
- http://esoftland.com/userfiles/file/gimib.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd9877de8d2dcacce0926b3e037a70e3/3608186054.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/12603d9ef36d4d23cd85ba7594cabc57/javomulaxitedeboxuzipad.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4g8f2mj3m6fnkprf8r5lock3eb/18606918751.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/42774647748.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a3de325f0---muxolamuv.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec474c12---jixaxalamobap.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f002782e96---26029439426.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d871c0af56---41446057616.pdfIn PDF document text
- http://archerelectricsupply.com/userfiles/file/zureredixej.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/zotifugiw.pdfIn PDF document text
- http://bestapp4u.com/admin/uploadedfiles/file/13150784417.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/152767878390a9c16e36fd5c6862929f/26620746353.pdfIn PDF document text
- https://kop-trans.pl/uploads/userfiles/files/87031944581.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f2c6c94a---57561356279.pdfIn PDF document text
- http://biolabsrl.org/userfiles/files/49756781448.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d89c45a374819c749f36fa6936e14522/nuxozigamajomobiv.pdfIn PDF document text
- http://gyobel.it/public/file/sugixezipu.pdfIn PDF document text
- http://www.cenlajobinator.com/siteuploads/editorimg/file/11214680634.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160753f1d9c575---15071243386.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210530130043791.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000e2d2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE2D2	20308 bytes
SHA-256: `4124b340d1f0dd6176dae8f2b384243f4bd9a501a8cc02b73fa721d6ef304e4a`
`font_01_sfnt_off000105f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105F8	26284 bytes
SHA-256: `7c29d228d162a8f51509204665199c484c5d84e851f75c06a7dad42df4866941`
`font_02_sfnt_off000145dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015df4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15DF4	10576 bytes
SHA-256: `48dfab749de8f03032ad2bc389f1aa03641e95b7f82e43e5f1fe65ffe9dfc28d`
`font_04_sfnt_off00017597.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17597	3464 bytes
SHA-256: `a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff`

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