PDF malware analysis — malicious · d3125f40498ab653

MALICIOUS

PDF

88.1 KB Created: 2021-09-14 08:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 031b672aef75833cb086b642baf37329 SHA-1: 014008a6bfce1a98f427ee6d7b5e97da92093884 SHA-256: d3125f40498ab653da47a8093f1f34776e303d44daeb49aee64c496cfc72c12c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to disposable domains, likely to distribute further malicious content or phish for credentials. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially involving JavaScript execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613916962128e---54172667207.pdf In PDF document text
- https://etonbio.com/newsLetters/images/file/gojibomaleravabasizexaro.pdfIn PDF document text
- http://clubselectionvoyages.com/images/file/34571552870.pdfIn PDF document text
- http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/27332746229.pdfIn PDF document text
- https://aldaserwis.pl/ckfinder/userfiles/files/kabilijitatagarav.pdfIn PDF document text
- http://rkenterprisesonline.com/FCKeditor/file/suruzipaletogimolukivi.pdfIn PDF document text
- https://expobar.vn/app/webroot/files/images/pages/files/zejaruza.pdfIn PDF document text
- http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/18024368635.pdfIn PDF document text
- https://net-mex.hu/ckfinder/userfiles/files/pazularakajepemir.pdfIn PDF document text
- http://togclick.com/media/userFckfiles/file/64466152203.pdfIn PDF document text
- http://sandlnae.com/data/editor/file/64507673126.pdfIn PDF document text
- http://yachtandgulet.com/userfiles/file/zerigazefojamaluvul.pdfIn PDF document text
- http://megalaserasia.com/upload///rufubidiwonej.pdfIn PDF document text
- https://cjsc.se/ckfinder/userfiles/files/57073443885.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9131b46cc---56118121001.pdfIn PDF document text
- https://fix2go.info/userfiles/file/xibinidazorerakexileredi.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/56257109780.pdfIn PDF document text
- http://teresachild.com/upload/files/81837216046.pdfIn PDF document text
- http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/poluzeguvan.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/nidujisavofamid.pdfIn PDF document text
- http://liavanhaeringen.nl/userfiles/files/69002025135.pdfIn PDF document text
- http://agroanaliz.by/upload/editor/files/71688343534.pdfIn PDF document text
- https://3rproject.eu/ckfinder/userfiles/files/70218665541.pdfIn PDF document text
- http://aotwcasino.com/ckfinder/userfiles/files/88029205378.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=javascript+free+download+for+android+mobilePDF link annotation
- 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_off0000e83e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83E	21480 bytes
SHA-256: `bb2622f8def77ca8f16cb30169e603ef0c7edb659f80b6da6289b7a22ea7246f`
`font_01_sfnt_off00011f72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F72	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13789	11064 bytes
SHA-256: `78811fa4a424c78b1198332d011e32d5036fe2baea7a1e20dcb83d45a6b7cb39`

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