PDF malware analysis — malicious · 951ac4f84b107f41

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 02:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 17d60c5082ed405782e59c44ce95e235 SHA-1: 6346c8b90d032875daf9d82b2c50e5516368ebdf SHA-256: 951ac4f84b107f4182115293fba5bfde911171bbd5205e3b1d5911cfd594fc5c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://studiotecnicoarduini.eu/userfiles/files/3202577941.pdf In PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b06e6a955---12537384997.pdfIn PDF document text
- http://escqatar.com/uploads/userfiles/file/file/32353706457.pdfIn PDF document text
- http://hidramaco.com/files/files/livarubujave.pdfIn PDF document text
- http://tlumacz-lipno.pl/pdrzewiecki/files/52961553305.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/pafovi.pdfIn PDF document text
- https://partnermind.cz/images/files/vikejawinoxilutabenezupin.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d557a9f71c9a3bdc3d0b4751af2165b3/liguxikojoruzesifosa.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0c601e0484f802a68ad7afaa3785a92b/50612638695.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6a45117dd8a56d747aa083018ca084c1/68952100145.pdfIn PDF document text
- http://bodegaadrover.com/userfiles//imagenes/fisekufaxaronajeboza.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/62816959739.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/75850924233.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/51980794770.pdfIn PDF document text
- https://jmcoverseaspvtltd.com/uploads/files/zutidobasilodumedeguson.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb8a8bcdc---13615267757.pdfIn PDF document text
- http://www.bandungmesin.com/file/direjifowoxetoj.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/84a77f1ef49654444894fcd710c51495/69177796476.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163ad650433---pogalorixoludox.pdfIn PDF document text
- https://edu-mate.kr/_UploadFile/Images/file/wubujupibe.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483b795fcf---71009447060.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805c79d438e---23671421127.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b3fdff0d15---15218555055.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/97243512617.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/8378583025.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=english+worksheet+for+class+2+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_off0000c338.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC338	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4A	16968 bytes
SHA-256: `fcffff8c699ecf282121e322404d31e7695de0a19653ab2d44f0b01eee446de2`
`font_02_sfnt_off0001062b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1062B	11180 bytes
SHA-256: `05705c18afb5f3eb03b1d21f4a86ce6549aa777497f4649a1e7b71e09d823492`

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