PDF malware analysis — malicious · e8db484af9988f98

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 02:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c82e1e17dd1c2033c2c64f25ad60d0f7 SHA-1: 502f616c240d62abe830844f1cf54e43f62fe3c3 SHA-256: e8db484af9988f9877bdb45801923b61b16ff6cc4cb123656edad95aa7dcd5b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external malicious resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=personification+literary+definition+pdf PDF link annotation
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9c431731ec63689bdf622f5224d39f94/jatuwuxowivamemasafut.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e842dde25db---vatodozudo.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/784ec36116611517f93bf4bb95050784/mefog.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79652698006.pdfIn PDF document text
- https://reazfarah.com/ckfinder/userfiles/files/15811816857.pdfIn PDF document text
- https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d3164a0c71008712798f4397fef6a8ef/32820220034.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee775ec660---52300554458.pdfIn PDF document text
- https://shen-su.eu/gfx/userfiles/files/xuxobumofubopa.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e154a750a---ludazepotugasigunase.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f9514ca9---3496388294.pdfIn PDF document text
- https://orangcar.com/app/webroot/upload/files/27556469612.pdfIn PDF document text
- https://rozgarnetwork.com/ckfinder/userfiles/files/babuxeda.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a371c8bc7bf---6163112544.pdfIn PDF document text
- http://bjaimama.com/data/upload/2021/05/file/202105112143063127.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/22400670361.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d9fc636fc3129b1faffccef85f21ad7c/nenokiliwopap.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5764bfcd1---17630909682.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/firirumiwami.pdfIn PDF document text
- https://infrastone.com/userfiles/files/zixebavevojeve.pdfIn PDF document text
- http://starrsgazette.com/admin/images/file/1264990820.pdfIn PDF document text
- http://seteo-dechets.com/images/file/zenirosaxekovunebigut.pdfIn PDF document text
- http://amongelite.com/ci/userfiles/files/fonelarijila.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/kidajekemaxabenawonaw.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8jautkvp84p3cs8a07pd3bber0/benatutasaxewuvesopufize.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/42243635958.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/kizajanovenuzuwaku.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcae75cc2---22769028657.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_off0000ed8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED8D	18428 bytes
SHA-256: `320573389a6562fb62b8c68a7bff835c9eaa625c9d4e8b4d82ef168bc3f79c09`
`font_01_sfnt_off00011d1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D1F	10728 bytes
SHA-256: `f87b7ca21666fba1c6179195e712713a559eee84e58d5f1912fed8b9c4f474ca`
`font_02_sfnt_off000135f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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