PDF malware analysis — malicious · 082d8fa4258e24f3

MALICIOUS

PDF

89.0 KB Created: 2021-09-23 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 926e2f838657f9d21dabf854b6292404 SHA-1: f920cebb6e64ff36e6a9eab4aedc16151f39c7c8 SHA-256: 082d8fa4258e24f3be733e8392ccbb9f17e1eb8aeef279c5d14bb825dad0a533

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=best+android+phone+to+root PDF link annotation
- http://timnhanhonline.com/upload/files/dowoguworimuzuxegebafej.pdfIn PDF document text
- http://hoachattn.com/image/files/tebukolaratojewewunadodok.pdfIn PDF document text
- http://juditphotography.com/picture/userfiles/file/28230219207.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403485e874e---51239611029.pdfIn PDF document text
- http://transcash.com/ci/userfiles/files/7748728002.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/61370933427.pdfIn PDF document text
- http://st03.it/userfiles/files/75273846603.pdfIn PDF document text
- http://yournamebadges.com/withyourdog/cms_uploads/file/wevivizet.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
- http://saxonrt.hu/img/userfiles/files/41779611681.pdfIn PDF document text
- http://hqshop24.com/userfiles/file/27975804919.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb7ca001---danupujubutebexuluzomeb.pdfIn PDF document text
- http://misosmile.com/upload/editor/files/fezisasuvexowuxopisavi.pdfIn PDF document text
- https://perfecthospitals.org/ckfinder/userfiles/files/dezaxosowivatozerogipul.pdfIn PDF document text
- https://jodhpurtravels.com/nbloom/fckuploads/file/xopasememit.pdfIn PDF document text
- https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/zajinorotusuv.pdfIn PDF document text
- http://ranjitabiswas.com/userfiles/files/zomujen.pdfIn PDF document text
- https://vieclamday.com/userfiles/file/83028983245.pdfIn PDF document text
- http://radio6deenero.com/uploaded/files/83467100724.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613698650777d---35076599230.pdfIn PDF document text
- https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/67596693040.pdfIn PDF document text
- http://lineshare.net/upload/files/20210909105432.pdfIn PDF document text
- http://copperscrap.wasteequipment.net/ckfinder/userfiles/files/48819690188.pdfIn PDF document text
- http://knshzj.com/CKEdit/upload/files/neguwelakima.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/rujatawewuxibamaneli.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_off0000f529.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF529	18876 bytes
SHA-256: `f3514f748dd2759ee4026dc14cc545926decab7a1ad799abe6fb3c1cb1fcbd33`
`font_01_sfnt_off0001263c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1263C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013e53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E53	10496 bytes
SHA-256: `3b67a9eab312fc087ff7aa5a85e7294bacc1bdbd42ff21919ab054df41e6de8d`

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