PDF malware analysis — malicious · cb1a4a4d098f3513

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 00:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e1ae770377d3297b96864c620fa7cf41 SHA-1: ffc2e3ae2e02c34979a3dc74702eaa0e86d7d242 SHA-256: cb1a4a4d098f3513c826aa12b0906d1afdad4bcc7853d11d58ae26df092ce9f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external sites that appear to be hosting other PDF files, indicating a link farm designed to distribute malicious content. Heuristics suggest these links are on compromised CMS uploads and disposable hosting, increasing the likelihood of phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e14666712---vibopiwaxizuteniruxami.pdf In PDF document text
- https://cecprint.com/images/file/xuripu.pdfIn PDF document text
- http://goref.ru/files/file/kilifa.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/11808353905.pdfIn PDF document text
- http://kistours.hu/userfiles/file/91062849526.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4b0ced1593921e916c3ec10c15934ca/gesepafalezekilijewu.pdfIn PDF document text
- http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/9919960714.pdfIn PDF document text
- http://danielbushreunion.com/clients/41596/File/75765926426.pdfIn PDF document text
- https://www.cylinder96.ru/admin/ckfinder/userfiles/files/69852390498.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/nagegivunonufupivosi.pdfIn PDF document text
- http://wrtour.com/FileData/ckfinder/files/20210530_353C4ECDFE671B02.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/60050609188.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/44879314499.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081009af3fb1---3214795635.pdfIn PDF document text
- http://hanlacsclub.com/ckupload/files/xuleg.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125824e421c0---nipowow.pdfIn PDF document text
- http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/84574417637.pdfIn PDF document text
- http://hoitruyengiaocodocvietnam.com/uploads/image/files/8944937427.pdfIn PDF document text
- https://boyanbolyarski.com/userfiles/file/69626906252.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6e59b67609d11c4d281c807615ecca78/18531030196.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/simidesafo.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/vikidudorelugodamas.pdfIn PDF document text
- https://ehlibeytalimleri.com/resimler/files/jatifepajalowakonite.pdfIn PDF document text
- http://goteneplast.se/files/images/file/89202926006.pdfIn PDF document text
- http://x-site.by/upload/editor/files/wipik.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=edta+solubility+in+waterPDF 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_off0000e0c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8D9	19288 bytes
SHA-256: `97397b84c86ff63d76d7d4c9f8ebaa35e248382e8846e8ba25bf76b953e845b2`
`font_02_sfnt_off00012bf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BF2	10664 bytes
SHA-256: `1398e817b2475cb96424b0f779bdd45b869f5dbe99b5978f0d20828af6e1d735`

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