PDF malware analysis — malicious · df1e1c974a23b69f

MALICIOUS

PDF

174.7 KB Created: 2021-07-23 12:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: f9014c7127efaa6e60dd1008525a9bc6 SHA-1: fe511f65329ae39714ea010f51375e36782dd84e SHA-256: df1e1c974a23b69f5e85798047f229f4e5e9f1bf8de62ff9922a3d1346cee8ca

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of numerous external links and the 'download button' heuristic suggest the document is designed to trick users into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8285

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://yarpaket.ru/userfiles/file/wojanu.pdf In PDF document text
- http://viajesalaos.com/webroot/img/files/lewatixegixugap.pdfIn PDF document text
- http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/95664006040.pdfIn PDF document text
- https://arhometutor.com/userfiles/file/wapumi.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/224cc3a0ed951eb1859c318261c855c0/moses.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480186a6cb---21802383094.pdfIn PDF document text
- https://greenline.bg/userfiles/file/xunatisavegezopenopup.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/081836d040711a0168706e42a061c50a/3100721643.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609574d8e6d98---36138386882.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/933f2b5efd21164aef96b40d72d0ecf4/bipisabiwidite.pdfIn PDF document text
- http://jubileejec.com/userfiles/files/rugifojagateladanujob.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8046ff3b94---94582233858.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/joxesewebodow.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0e66a65e1703054c42051be0e6a40879/zotagugu.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9qcq8sc5a3tu2a7gu95hq64vq3/65753413349.pdfIn PDF document text
- https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eusg41iveg3lcdup0f5t2l327r/34163411819.pdfIn PDF document text
- http://www.urbanwaterways.info/files/zedemasadakatoduboladow.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdefd53de0---20409702009.pdfIn PDF document text
- http://bichvan.vn/upload/files/47432307388.pdfIn PDF document text
- http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/vuxub.pdfIn PDF document text
- http://www.niziointerior.pl/upload/file/43818003347.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c19030766---29669610622.pdfIn PDF document text
- http://ratchee.com/ckfinder/userfiles/files/95084086102.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/64698246798.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ff237aba---jajufuv.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=power+electronics+for+technology+by+ashfaq+ahmed+solution+manualPDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6826e31c74407b706dea5d263568fcd5/81294039982.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081242f09ae3---sojoveledatolubig.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_007_off00022079.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x22079	23728 bytes
SHA-256: `a3c9a718bde68856b42034075a87d3c8e957ea8ac5e702db8a1b0ac1f5e24b84`
`font_00_sfnt_off0001edbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1EDBE	11508 bytes
SHA-256: `a7aa440ff6df81df65d1c70ebd558b20cd245db10317878d0df1c7f18a7b2d63`
`font_01_sfnt_off00020868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20868	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0002496a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2496A	22304 bytes
SHA-256: `a5097c1e87761b7b6ce41760d6389c593169f5b68acf81a6f65caee5a639d679`
`font_04_sfnt_off00027fc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x27FC7	13716 bytes
SHA-256: `a07f5e13c3938f18fca21bc5fac701e05567a9572848abd23fff9efafd1bcc32`

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