PDF malware analysis — malicious · 764236320838d088

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 23:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 31ad154d8ec043e41f3128685d83e348 SHA-1: 2bba6c81feae0c6619db2fc0c5e92c04b3f2c6c1 SHA-256: 764236320838d08871e46c8f214599f79ddac1792ce6b9b29b0ea15cdeb23316

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to lure users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=google+dorks+tutorial+pdf PDF link annotation
- http://interroadholland.nl/userfiles/file/34711233147.pdfIn PDF document text
- http://susasoft.com/upload/userfiles/files/femudus.pdfIn PDF document text
- https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/42389922920.pdfIn PDF document text
- http://wjvanderheidedienstverlening.nl/uploads/file/42524184261.pdfIn PDF document text
- http://ilksolar.com/Images/Media/files/nuwin.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdef3ae37---febanubufime.pdfIn PDF document text
- http://kaowei.tw/image/files/20210608_114214.pdfIn PDF document text
- https://fotojursa.cz/userfiles/file/67878728442.pdfIn PDF document text
- https://nisahanpin.com/calisma2/files/uploads/18209065520.pdfIn PDF document text
- https://carparts-fixture.com/file/file/3132800994.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ov1l6ivp1u7fbu81h46u6vohmj/47627962529.pdfIn PDF document text
- https://zlato-eu.cz/upload/files/4664712663.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55379267884.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/200d628c178160ffb5cf30e1f93f4e30/zanujopikuledamabi.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5726fbdae8---katijuxovekizekami.pdfIn PDF document text
- http://youzedu.com/ckimages/files/20210830215412809991.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/86958397980.pdfIn PDF document text
- http://kancelaria-perfect.pl/app/webroot/media/files/xuwusak.pdfIn PDF document text
- https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/29408b88b7a8b3ca26ed2bd5a4f963b0/31880048730.pdfIn PDF document text
- http://pnktools-th.org/ckfinder/userfiles/files/karuxutokisuvup.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06416a9ae---xozejigulozituxofil.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf09daff12---gifusopirezakofon.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_off0000e692.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE692	18680 bytes
SHA-256: `bb7f469b74751d4568df87056a68b5263e9205bbf43a7527d5d74858f4bef3dd`
`font_01_sfnt_off0001177a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1177A	10800 bytes
SHA-256: `355ebd2c0171581aae0fc298b0f02d6907ecf34c8e91214db84276a8eef7fc66`
`font_02_sfnt_off00013055.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13055	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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