PDF malware analysis — malicious · 7b4b5bc6ec1331ac

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 21:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4c29994c193b869079f9c25b4d15e3d2 SHA-1: 2137981c6387e1e668bb30e897ab68db7ac1bb70 SHA-256: 7b4b5bc6ec1331acc98ec68f09c0bcb98e6c40c08553d28d51d1ab051d4e6e46

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm indicators suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=how+to+delete+the+cache+on+android PDF link annotation
- https://huaku3c.tw/uploads/files/202109131802558926.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210903131002.pdfIn PDF document text
- http://cbcom.eu/ressource/site-image/files/xawasetexotudazejisolaso.pdfIn PDF document text
- https://eminencesolutions.in/resources/userfiles/file/vezumuroporejabevanurud.pdfIn PDF document text
- https://renebeumer.nl/userfiles/file/55747103956.pdfIn PDF document text
- http://cleversystems.ru/userfiles/file/morofileribubiwoxibaju.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4724fa04---nesewumodagazo.pdfIn PDF document text
- https://riosemarescentrodemergulho.com/ckfinder/files/64970961897.pdfIn PDF document text
- http://physio-praxismitte.de/userfiles/loweluzawujadobovimaw.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8c7556bbd2b403f67630bff713c120c1/9030307171.pdfIn PDF document text
- http://gorsilawfirm.com/userfiles/file/10140633105.pdfIn PDF document text
- http://0985028898.kad.tw/kads/ckfinder/userfiles/files/13824145126.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55627340929.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dc61b0c7398f028b05304ad0e20d6cc4/sogowuwopibijuj.pdfIn PDF document text
- https://gregoryshow.ru/files/file/84067290810.pdfIn PDF document text
- http://dsagco.com/Upload/file/rimemebagidoxala.pdfIn PDF document text
- http://www.miyadenthai.com/image/upload/File/vizowizitogorigu.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/lutekafilogivezelelilobuv.pdfIn PDF document text
- http://peknanevesta.sk/media/file/857568455.pdfIn PDF document text
- http://tcsklife.com/filespath/files/20210905085148.pdfIn PDF document text
- http://accutindustry.com/Upload/files/20210917162959.pdfIn PDF document text
- https://saleskerala.com/ckfinder/userfiles/files/40073571335.pdfIn PDF document text
- http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikomalowetup.pdfIn PDF document text
- http://dui-antidote.com/images/userfiles/file/67843041658.pdfIn PDF document text
- https://uleshuzatabc.hu/files/file/bilujepezajopazupa.pdfIn PDF document text
- http://sarica.com.tr/ckfinder/userfiles/files/82246028081.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_off0000de12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE12	17560 bytes
SHA-256: `d840bb4a7ecbb5056d891e0daff72d10138be4eb99450e47f26c9e530c5de052`
`font_01_sfnt_off00010b73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001238a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1238A	10376 bytes
SHA-256: `f250022ee6232c2d6f04bcc416d3522391ac8ec40f0459ad9d337f1f463993d1`

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