PDF malware analysis — malicious · 7b6b1bdaa32c5aa2

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 17:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ab271f7ef582f327a9da27487f3ba8fe SHA-1: b8516096f23e93283ea51465d57e95e061610c6a SHA-256: 7b6b1bdaa32c5aa23328b7c994f0d9ec9cf5f1efccb23d550d2c90b32afaadb1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=summertime+porgy+and+bess+sheet+music+pdf PDF link annotation
- https://ipic.vn/userfiles/file/17742468727.pdfIn PDF document text
- http://bptramptour.pl/files/file/subemitorozazovoxuje.pdfIn PDF document text
- http://a1-automotivegroup.com/upload/files/48640124097.pdfIn PDF document text
- http://fapannimario.it/userfiles/files/bavutoxutotoxekawer.pdfIn PDF document text
- http://ghettaetamionarchitetti.it/userfiles/files/90358541909.pdfIn PDF document text
- http://ekotop.eu/userfiles/file/vukojeravekupido.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c231e9096c---47354141495.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b523e856ca6---jekomezimobopikasaxukes.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210728/file/gofederutasifedute.pdfIn PDF document text
- http://www.aportecnica.com/imagenes/editor/file/54200927752.pdfIn PDF document text
- http://benetalent.com/upload/files/31075035634.pdfIn PDF document text
- https://likeevent.it/writable/public/userfiles/file/kobajefuzez.pdfIn PDF document text
- http://midel.me/userfiles/file/6767638874.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ruopuil6i7cu9f74i1rsiaaqpo/xufabafuxonusulavomeged.pdfIn PDF document text
- http://pure-chiral.com/upload/files/popafibaremetolaxijukimim.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607349a7de707---8397096902.pdfIn PDF document text
- http://cn-biyoute.com/d/files/ladegibejofafizipegibep.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fabde5e9c7c---80818374479.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e5e940ab---wilunogaxojavaselikopi.pdfIn PDF document text
- https://cuatudongbinhduong.net/uploads/files/lexagomamenisigosabedi.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7re0sghi92jh3rlr7kc4hq6gt/7131202489.pdfIn PDF document text
- https://tdfstore.it/file/tufivujevemalodexis.pdfIn PDF document text
- https://kalnapilis.lt/kalnapilis/web/web/ckfinder/userfiles/files/bewaviwabolasix.pdfIn PDF document text
- http://digitalpolicycouncil.org/imagenes/file/39802145998.pdfIn PDF document text
- https://daks-96.com/f/uploads/files/13656923706.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b70218893---61041898621.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_off0000c3b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3B9	11448 bytes
SHA-256: `e7c3c93d653baaf5ad7ca748bd4ed65bae5192b39855282832b8fca9ef3b460a`
`font_01_sfnt_off0000de2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f641.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF641	17344 bytes
SHA-256: `513344ba44b930a90f09b07515b3792fa7f452251acc86b87d7f4d4dfc71c43a`

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