PDF malware analysis — malicious · 3b2c60b479ceb204

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 18:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ff8b97168555c8d6fbf1dac0243e1d8f SHA-1: 57fc16c537b2b369b4f8db4494867c334ac35a72 SHA-256: 3b2c60b479ceb204596c316978f8333f7ee349842dbbef2664e5b18950215fe0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting. This indicates the file is likely part of a phishing or spam campaign, attempting to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://wastran.ru/uplcv?utm_term=corporate+tax+planning+mba+pdf PDF link annotation
- https://tolgyesvolgy.hu/userfiles/file/doliduvotefupadavuvef.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/5117114855.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/vesavemupar.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/51ltvdou3jc64vig9m3m7tgmo2/falaxoxorix.pdfIn PDF document text
- https://simplehome.ro/ckfinder/userfiles/files/denife.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/93515900673.pdfIn PDF document text
- https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/58098580717.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fb7c4a862fdfa2f468cebc73f06985ef/49387248153.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c962f13bf3b---74402094365.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d80c045a9---34918878084.pdfIn PDF document text
- http://palami.by/images/file/32208053181.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/80358045218.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/44171062306.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mibobidubejesirotilemedok.pdfIn PDF document text
- https://prtl.pl/userfiles/file/sibozamotabuzupufoxe.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078336bdc1e2---38917523248.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7c04e76b290b22725c3f38595fbd8165/timudujalironakaliwafu.pdfIn PDF document text
- https://vcubusinesssolutions.com/userfiles/file/risevejikonenu.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3972215f---33174697370.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c84fb9cee---tibovefalatakibubu.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/dadoxesoxuwaguguroto.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c662c6227f7f09a83652b0e677f9c8db/45300358151.pdfIn PDF document text
- https://eletvital.hu/uploads/files/28024434883.pdfIn PDF document text
- https://mmtours.si/uploads/tedipazogoxurakewafitu.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ae46599b602844331d2e5880e6670c1f/65288115079.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa20bb1a61---medogijumazesapanej.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_off0000bd88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD88	15732 bytes
SHA-256: `b7a94ff2581bd55bffc98b6ced2a4f57f4fc0bdefff04657965a41249f0d3328`
`font_01_sfnt_off0000e4a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fcbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCBC	10948 bytes
SHA-256: `4d30898300cfc1e9c6c602b292099d0ad0b2c26cc7badca2b7dbc8bf9cc9a3d6`

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