PDF malware analysis — malicious · bb5c86aade128541

MALICIOUS

PDF

89.1 KB Created: 2021-09-12 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 18819d7c6081de80cb1f1729b593fc44 SHA-1: 11053d48a308ffde7002e729670e31193b6cb157 SHA-256: bb5c86aade128541229543924786b21771989241a0c34ce7718baed8d83ee54d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristic suggest it may leverage embedded JavaScript or exploit PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 http://ecohouse-lab.de/userfiles/file/4189377058.pdf In PDF document text
- https://rozynoklinika.lt/userfiles/file/53152667985.pdfIn PDF document text
- http://idominjazz.com/fckeditor/userfiles/image/puregamifunutuguvabiliket.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d663dbe3c7---puxezozejowagubovapet.pdfIn PDF document text
- https://biocenfis.es/uploads/assets/file/fofavajiremomenifixaju.pdfIn PDF document text
- http://kerama.altrodesign.eu/ckfinder/userfiles/files/48141302509.pdfIn PDF document text
- https://clicksnepal.grnca.org/img/files/files/74863716646.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff3b6ec4a5---gijanokawaxok.pdfIn PDF document text
- https://citrasas.com/ckfinder/userfiles/files/rarapejogowebagapure.pdfIn PDF document text
- http://traktorpulling.de/ablage/userfiles/files/79052962803.pdfIn PDF document text
- https://jjcfurnituremaker.com/userfiles/files/kapixiribubesoxagim.pdfIn PDF document text
- https://sunnyrosesschool.com/userfiles/file/75452687400.pdfIn PDF document text
- https://brianspradlin.com/userfiles/file/46387321244.pdfIn PDF document text
- http://rrmkaryacollege.org/rrmkarya/userfiles/file/16819898956.pdfIn PDF document text
- http://studiopedrazzini.eu/userfiles/files/125403232.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11086238176131877bc2d62.pdfIn PDF document text
- http://belly.bpv.su/content/files/files/31910734235.pdfIn PDF document text
- https://www.tristar-technology.com/ckfinder/userfiles/files/magovefazigupevifilow.pdfIn PDF document text
- http://er-trans.com/img/produkty/files/37762566225.pdfIn PDF document text
- http://bbmeti.it/userfiles/files/43517621548.pdfIn PDF document text
- https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kajuwuzenalek.pdfIn PDF document text
- https://eventaipei.com/upload/files/53843616111.pdfIn PDF document text
- https://mraos.com/web/userfiles/file/roligodaviduzewoxo.pdfIn PDF document text
- http://consulcongress.it/uploads/assets/file/3612633060.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b8683cff3a86fd2ee3706301084b519e/91450353448.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=johnny+english+reborn+full+movie+freePDF 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_off0000f57b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF57B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D8D	18388 bytes
SHA-256: `6252ebf11fe5fb7a1ac0c0adacdd783f0a28a0e8d4cbd07326e2be83da863494`
`font_02_sfnt_off00013dd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DD6	10812 bytes
SHA-256: `c5e2a1397035c756bd502de6370f0f8b28964eb2ec6aca886fc747ac56b176db`

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