PDF malware analysis — malicious · 8715883c063b88e7

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c21cba8df96499caffc1cbcdd5219ea4 SHA-1: 8aaea11141958956490b50d311f1360af42e6a7c SHA-256: 8715883c063b88e79272677f4cb24cd11382441fd0fbfc93e03cae283c8d66fe

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the overall malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://allytemp.ru/uplcv?utm_term=samsung+usb+mass+storage+driver PDF link annotation
- https://exlite.it/ckfinder/userfiles/files/loviseda.pdfIn PDF document text
- https://akapacha.com/userfiles/file/rutibaxetotepulariwokexug.pdfIn PDF document text
- https://thokhoavietnam.com/upload/files/46467487971.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2fcfadc310e9a0657ae06dfd784b4546/kojexuluditoxa.pdfIn PDF document text
- http://trustycctv.com/ckfinder/userfiles/files/57062468355.pdfIn PDF document text
- http://karaokejdi.com/ckfinder/core/connector/php/upload/files/bogosulunalovosu.pdfIn PDF document text
- http://veterina-hrib.cz/user-uploads/files/99119161051.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
- http://stisk.com/file/14750966970.pdfIn PDF document text
- https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/36795427493.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8daa510d---pedubokokijunukejokowak.pdfIn PDF document text
- http://zussobrance.sk/grafika/dokumenty/fuzivobapevonusomokaz.pdfIn PDF document text
- http://sangtaoad.com/uploads/userfiles/file/98438254520.pdfIn PDF document text
- http://czyxchem.com/upload/files/30831168075.pdfIn PDF document text
- http://oilmachineydy.com/d/files/79866465457.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145976a904f0---wedizexedunomiv.pdfIn PDF document text
- https://reha.bg/content/upload/file/zawanunofodanaxo.pdfIn PDF document text
- http://kompassztuki.pl/Image/files/6673465647.pdfIn PDF document text
- http://we-women.de/default/files/uploads/file/32346883167.pdfIn PDF document text
- http://mondoacquapiscine.com/userfiles/files/tonumazadenujaxumar.pdfIn PDF document text
- http://yansyuan.com/UserFiles/images/files/mowavilujakoxisepenom.pdfIn PDF document text
- http://kbchina.de/upload/58358993622.pdfIn PDF document text
- https://anup.bo/images/files/2318082809.pdfIn PDF document text
- https://www.bankkartya.hu/js/ckfinder/userfiles/files/38716133722.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_off0000b579.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB579	18352 bytes
SHA-256: `f3f034c2f562aa0acff570951a64006951e1dd2a9ed030e2dd0bd41fcbd7721d`
`font_01_sfnt_off0000e42a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE42A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fc41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC41	10924 bytes
SHA-256: `36d526706eecf7021f70cbcd7e11a7241b19eefa9257f9900b45decae5f624d5`

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