PDF malware analysis — malicious · cff3213d3b851c00

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 13:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 9411cf2e4fead1217ff21b9a7702b377 SHA-1: 0d6574e99e3fc17061d2328dc77ca55dcdd9c869 SHA-256: cff3213d3b851c0064faf89bc03e5f3053249ed6129f6a7ae4c5c22b23d95168

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, forming a link farm. The presence of these links suggests an attempt to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=str_replace+function+in+php PDF link annotation
- http://ugrctrani.it/userfiles/files/70937708009.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16083bfb9f33de---xiditisunaseg.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cdd415b5c---gufipedetijanol.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65e9a96b55535418b3d322fd7805f399/bazimipemopafuzul.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/kutore.pdfIn PDF document text
- http://telmeed.com/web/ckfinder/userfiles/files/71227904510.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3874d79507a5a509ac055ba4f8e61849/1317567995.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/segatubudonuwexufaxul.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddda9fe75---rakisikazoguxuxevobalemo.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64c3c7aad---rewetape.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085e61f9c89b---82958209523.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5aeb1df93842da60ca4e6d663ec7a81f/fuvavivimoval.pdfIn PDF document text
- http://stylekd.ru/files/lubidufa.pdfIn PDF document text
- http://zuche0551.com/upload/file/57109687958.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/djp9n3akhq1r19jf00dol6869k/49435447771.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hi47m9a3vh8smvsrk1qrolrbo0/6262593996.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8e7a1250---gifogizatinarirunuribugaw.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d6486d77---rarijavatotabisitamagep.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/uf5ls62ojsceuc284pp308a3b8/99655727273.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbafa700e7---50920937500.pdfIn PDF document text
- https://deesudcoolingtower.com/userfiles/file/13858283267.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/gomalat.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607443b270895---40517662219.pdfIn PDF document text
- http://kubabus.cz/novy-web/upload/file/dufolasumud.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0ead6211---rotapudanudirewumeri.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c8d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8D1	10616 bytes
SHA-256: `3b10e8cfd12b2231545ba70be0fd0eb5d47c05c01004404b525f0719f7aeb66a`
`font_01_sfnt_off0000e106.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE106	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f918.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF918	16640 bytes
SHA-256: `c54f8534860a03a4635e8dc4d0b61e6b739ff52bf55fc9826ccb51eb76142fa5`
`font_03_sfnt_off000124d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124D0	7776 bytes
SHA-256: `d3add65ffaee53827b3770ac6bfc432e902acd0d58c90a34e6fe9f0943c935e0`

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