PDF malware analysis — malicious · 10c3e634ad952f55

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16

MD5: 418590d1479d471cd09acb0eb5d92ed5 SHA-1: c4f2698dbbef1afa2d06af8e9e39678418130ce3 SHA-256: 10c3e634ad952f5520f6f79b605ed5b781acd673cd0147e6a3214e76d50b2ad0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, and the document body was unreadable.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d71df50---3268293712.pdf In PDF document text
- https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f46c2774---22498805659.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083175b15af1---14940836269.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0abaa296b---mozunebuwutivika.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/4664553148.pdfIn PDF document text
- http://allgeology.ru/ckfinder/userfiles/files/52605491767.pdfIn PDF document text
- http://kerekesvillszer.hu/UserFiles/file/xibimibedulenajibu.pdfIn PDF document text
- http://abwessex.com/uploads/files/jobisedididokuzufo.pdfIn PDF document text
- http://ahdjcm.com/upload/files/dibugatekujikitejeda.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/5314851348.pdfIn PDF document text
- http://zechnerbau.at/images/content/files/93923882960.pdfIn PDF document text
- http://eortak.com/img/fck_temp/file/fizezipazobiwap.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/xofogojimeb.pdfIn PDF document text
- http://agedwedfjtj.pretty-match.com/upload/files/dafuz.pdfIn PDF document text
- https://dreamscapes.ca/dream_scapes/userfiles/files/janinorened.pdfIn PDF document text
- http://hataylezzeti.com/resimler/files/dozulajewugumix.pdfIn PDF document text
- http://thainightjob.com/ckfinder/userfiles/files/sotobidowefimega.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6841e1bbe---bifolusepizev.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/kodurapategesafaliletiw.pdfIn PDF document text
- https://lamaisonducoeur.ca/upload/editor/file/79195493520.pdfIn PDF document text
- http://elijasprojekts.lv/files/file/dosiwagewuvimosebe.pdfIn PDF document text
- http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/sedemavurijinokakaza.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9c20cc85ad9acb1bfeb5af70a6b1893c/81950815120.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8b47bfc1682bc38ba60847ec07b29bec/guzonusa.pdfIn PDF document text
- https://dalycity.com/wysiwygfiles/file/lamogeniruruvu.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779deeeffe2---12328462804.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4886f4f9e314581d57618e2769868aec/97508440818.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=reproduccion+de+peces+guppy+pdfPDF 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_off0000ca74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA74	10748 bytes
SHA-256: `6e9fb2bb8f9bb05b26165a8f7ce2644d418617deef8429e02333e32f44c5a237`
`font_01_sfnt_off0000e312.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE312	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fb24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB24	17788 bytes
SHA-256: `335f086f152586ab0a83cdbc0105fda6a262ea345ecf1e5ed9e9d0c3e7d9b0df`

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