PDF malware analysis — malicious · 253705763a61de5a

MALICIOUS

PDF

85.6 KB Created: 2021-08-26 07:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b07f17a9f053b5e61fb192647091448f SHA-1: ad4a2b793ca286a1c3601b209318564bedc298dc SHA-256: 253705763a61de5a4360a7fc58cfd704fd44a2ebeab3f0ad263b0476defcf151

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 https://nomylo.ru/uplcv?utm_term=how+much+is+3+gallons+in+quarts PDF link annotation
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/44383b8c71a3303018710ca46dd52ce4/63078586939.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ekn00oe5o4ldoobcf7h3irb3u5/42450569926.pdfIn PDF document text
- https://acrgroup.nl/userfiles/file/47854311600.pdfIn PDF document text
- http://spc1991.com/ckfinder/userfiles/files/89261112272.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f062311d2---88498551348.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f7v9dmioljip4ris1i5a51kk42/kemexusodiwikop.pdfIn PDF document text
- http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/tabosevimeko.pdfIn PDF document text
- https://ilmercatinosottocasa.com/file/87869482452.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/998dea70f35872944c9f9a45960bb13b/gumulimiko.pdfIn PDF document text
- https://digireg.se/upload/65170720046.pdfIn PDF document text
- http://fujiya-burbank.com/uploads/files/zomefeposikesusoj.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/19751ad71f370eb758c6364733cc7fab/41196857577.pdfIn PDF document text
- http://say-international.eu/userfiles/file/zorabusoxisalawuxu.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae682c4b2f---wujuw.pdfIn PDF document text
- https://gachbinhduong.com/upload/file/xupiwajezifaxapigufesobug.pdfIn PDF document text
- http://veterinariomauracotti.it/userfiles/files/kifajeluberorefam.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608db70401f14---votepikipafilewixoduvevu.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o4rbf2n7fl6vk6ln6gphujmtsf/kejuxazojoju.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/618cc39f20162bed437232110c75688d/41780749627.pdfIn PDF document text
- http://podushka.by/files/files/57054129148.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d44166a73---4822926918.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/i1d5sqtg2ttdf6h16i3rr8v06d/55023447860.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/16259147955331.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/vijamasakixexafuva.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4887b29c83646184a3318bbf911128d5/pokutewezonesaxode.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b26779333---depulenokukotuma.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_off0000e8fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8FB	17188 bytes
SHA-256: `aae88c0b96f6a315b738a8266c61cbf76e7abe8c84d435193a63b98d9a62d0db`
`font_01_sfnt_off000115e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012dfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DFD	11040 bytes
SHA-256: `281266c5bd605c5375e50525748bc2eb241737a55d118d1c7320b59d5ce295c3`

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