PDF malware analysis — malicious · aaf8ec731a09231d

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 13:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 42100d860dd2096e0840274cc9d4ba1b SHA-1: 8ca0fefc2c0b037291d24fb7aede03b7a41d5b09 SHA-256: aaf8ec731a09231dc6da1a08c8d1541599b3d3afbbb2b5f00262362bcdb95904

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://anthonyvienna.com/sites/default/files/file/finev.pdf In PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4a0f75985971d59e6b5469f702ee6ce5/dodapexisatoxu.pdfIn PDF document text
- http://cdmatik.com/uploads/file/9274955636.pdfIn PDF document text
- https://webornate.com/viking1/uploads/files/14155807561.pdfIn PDF document text
- http://jorkurojus.com/userfiles/file/fegavibo.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ca52bd8b9d48faebc59149f8d936676d/12900629825.pdfIn PDF document text
- http://htwy.com/upload/file/71046582538.pdfIn PDF document text
- http://mellorymotors.ru/admin/ckfinder/userfiles/files/jigodexopatesusonidoti.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c981b274e1---67465276084.pdfIn PDF document text
- http://utuin.net/files/fckeditor/file/gokipemo.pdfIn PDF document text
- https://terminal.hr/userfiles/file/bewerotetemiwu.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a77ddbc5---birulagepujisokurijesuwak.pdfIn PDF document text
- http://otohondamientay.com/upload/files/81714440620.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/scoe17vuaaoppueiqg2i8ciup2/29571446846.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f3f45c8d---3245723265.pdfIn PDF document text
- http://apisicul.com/userfiles/files/saruzulewofemofizeje.pdfIn PDF document text
- https://jaurrieta.net/USERFILES_JAURRIETA/files/jusitiwif.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/30175370345.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/tegazugedo.pdfIn PDF document text
- https://walnutcreekguide.com/wysiwygfiles/file/kalim.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f513272dbc---85457988097.pdfIn PDF document text
- http://ebsenglish.net/_UploadFile/Images/file/5621373531.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h1eg56ha83qp1c5t74d6nm83oc/48221041028.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/egf1maf0m0urm0f6hdb0np57nc/29251561959.pdfIn PDF document text
- http://salt17.com/userfiles/files/38883380324.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+repaso+trigonometria+1o+bachillerato+pdfPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c8dada91---7794041610.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_off0000dbd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD0	20076 bytes
SHA-256: `69a7614c5fea674afb189531475235bd3ff27d2ae57adc0ab9fdca81d52c8ae8`
`font_01_sfnt_off00010eae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EAE	11372 bytes
SHA-256: `4e03b229fe8a946662e2ef68320a400e89be5336a220baecbb1360a350c4f590`
`font_02_sfnt_off000128d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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