PDF malware analysis — malicious · 879dec6e7187e49a

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 17:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 623a250d7ca421b36585f3ac955a69f4 SHA-1: 824f50587fd58cd7478e1d460b4397750804f859 SHA-256: 879dec6e7187e49aec77c742584c78b2a9349188bed90527a1380480806b2491

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://tehnicgaz.eu/files/file/78611309930.pdf In PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d848911b541770c6ed75590bcae2cb05/9543921420.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcab9dc5da---4866282913.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eb4c910c43---wedomokuzubula.pdfIn PDF document text
- http://hoya-system.com/uploads/files/202108211644185321.pdfIn PDF document text
- http://ilyxrace.com/userfiles/files/50860049196.pdfIn PDF document text
- http://hoshitorionline.com/uploads/files/luzosasivewefuko.pdfIn PDF document text
- http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/17141331507.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/dafefidozakomol.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b84d8610---36217781987.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/fetumupokin.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5de5b822---sasunavur.pdfIn PDF document text
- http://yacpa.org/yacpafiles/file/75502145805.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161088b0748904---mezinetivigelepij.pdfIn PDF document text
- https://aldurra.ly/images-editeur/img/file/pikozu.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eceb57c859---63049188847.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff92533bea---ximezegilut.pdfIn PDF document text
- https://spotiverify.com/ci/userfiles/files/25394514792.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b0f8313d---54507262718.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ogioa6dvjlb0smalapvqs52bhk/99408518451.pdfIn PDF document text
- http://fatfailogistics.com/fckeditor/files/file/62877230860.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce033fa78---30557098616.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e83498e9---kikolopusikagazagazed.pdfIn PDF document text
- http://almar-bus.pl/userfiles/file/businu.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab888de673d---wuzuvixekizo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=durrett+probability+theory+and+examples+2nd+edition+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_off0000e2d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2D8	11340 bytes
SHA-256: `1d40ba7eee90c706b4f74c2c7021467023d9ce3269de01477e25b95c74ee8fbe`
`font_01_sfnt_off0000fd28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD28	22344 bytes
SHA-256: `dc3331db9d935a3aab3fe50ffd4385d28aa3de538095c2d3b34f41e42ca99bcc`
`font_02_sfnt_off00013871.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13871	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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