PDF malware analysis — malicious · a67a7f19bf53e110

MALICIOUS

PDF

103.1 KB Created: 2021-09-02 08:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1ccc98b0790f6140e3fb21de0f30a316 SHA-1: d57b8f895a65f903f5b030a4ed25bec7a0f1aa5a SHA-256: a67a7f19bf53e110044115e63020f03bbac54fca914e99f3f3dd25c8ab3ffc04

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9790

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://smidgel.ru/uplcv?utm_term=hydrologic+water+cycle+diagram PDF link annotation
- http://mlight.cz/archiv/file/37987432545.pdfIn PDF document text
- https://clove7.com/userfiles/file/pokewapowolopadepavuv.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae260132355---vedem.pdfIn PDF document text
- http://wonderpanel.com/app/webroot/img/file/wafumowum.pdfIn PDF document text
- http://magendans.com/imagefiles/file/9747134123.pdfIn PDF document text
- http://scamps.biz/userfiles/file/mofolupivuma.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2a2e5cbd1b00fb4147f288542851530b/1535183525.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611567ca4e971---65627047027.pdfIn PDF document text
- http://wooshin.kr/uploaded/file/79393770760b35e8fb12f8.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ad6b89cc3d7a4f835657969333f67d91/pepajuborobabotebasiziwa.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210705155004.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6p6a6s84rbrs708igquirsr1s/81225936709.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/40ckeiiq7to488aqadmhs5d5j7/tarukuv.pdfIn PDF document text
- http://vector-luczak.pl/new/fck_user_files/file/budefojer.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8cee1d06---2605136832.pdfIn PDF document text
- https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160776aa802900---19559957645.pdfIn PDF document text
- http://bukhatirhomes.com/userfiles/file/fuzegefufoxujojefosaleve.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cc4aee17e239fa883c64a65fda5eb01c/36000009843.pdfIn PDF document text
- http://adacu.org/userfiles/file/20210815194355.pdfIn PDF document text
- http://alisawedding.com/upload/users/files/popukabadiludibewanofibeb.pdfIn PDF document text
- http://bbpcosmetics.com/admin/upFiles/2021-7/file/73568504147.pdfIn PDF document text
- http://gianphoiduyloimodel.com/Images_upload/files/jamukisukuxu.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffefb79b00d---75309599843.pdfIn PDF document text
- http://vizcsap.hu/files/file/84376950975.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3962fd030a3659d4b6ffda37dc11a0d8/gasuradapenir.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/94q0bceiv3ct98gql8mpgngjfu/kepuxofuvobaxil.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_off00012bec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BEC	19416 bytes
SHA-256: `b2d454b3b90fc8d8177fd4dc15fd1473777d3002f55ed371fde49854135f5bab`
`font_01_sfnt_off00015eb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15EB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000176ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x176CE	10632 bytes
SHA-256: `9056a8f44fba2cb83b5c22ead096ef6f66e039fada01ffe28e83b564ca92bce2`

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