PDF malware analysis — malicious · 3bfd381fdc21359a

MALICIOUS

PDF

93.8 KB Created: 2021-07-31 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9c6d2f1b69bdf59dfb9c462e54f94573 SHA-1: c0e5594d9ee8e70f62c0bc4059deeb8b2733d7e2 SHA-256: 3bfd381fdc21359ab613c03f829df6eab7d864a73950f2104578aacd05f99e95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination and evade detection. The embedded URLs suggest an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

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 https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gthlbji5cc3s79t2uf72btbnu7/kopaxej.pdf In PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ac9a7ba8f055bf27f4546b5e6ce8bb40/kadovemugufupokilejanew.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/s45jjmjgdtbc36p98elb8mq90q/nabivir.pdfIn PDF document text
- https://www.adoz.cz/ckfinder/userfiles/files/rujesafogefupupu.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80a3730af---vibuwa.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/20187296632.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a63c33d8---43628034363.pdfIn PDF document text
- http://gewald.ru/content/Files/87439009352.pdfIn PDF document text
- https://arabacioyunlar.com/calisma2/files/uploads/pudodo.pdfIn PDF document text
- http://amy-tsai.com/images_express/userfiles/files/vomudafapux.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3974ab4d4---32720168060.pdfIn PDF document text
- http://polletnv.be/uploads/files/mulodupujefezel.pdfIn PDF document text
- https://lawrenceyezersky.com/userfiles/file/vujufe.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb65f74e33---65394125439.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f9977f85f49---nuluzenep.pdfIn PDF document text
- http://iphysiology.ru/upload/32972457467.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a150a68112f---wanesegi.pdfIn PDF document text
- http://belhavenhighschoolalumni.com/clients/13962/File/tazafamevodetizesojebi.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c0aaf529---93523763541.pdfIn PDF document text
- http://shreyaghoshal.com/konadnew/userfiles/file/76130905718.pdfIn PDF document text
- https://pima-alarms.rs/slicice/file/wexuperejefegolefogi.pdfIn PDF document text
- https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/bepunorazo.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e2a574be---61299648300.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/93156259165.pdfIn PDF document text
- http://staresecurity.com/userfiles/file/xusigivi.pdfIn PDF document text
- https://mauspro.net/upload/files/54329139547.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=excel+formula+list+with+examples+in+urdu+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off000127de.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x127DE	22108 bytes
SHA-256: `fd6021e65bd711f232aa896c5829e5c5a6c26e6edcb91958703e86f043461b1a`
`font_00_sfnt_off0000e0fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f90e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF90E	17952 bytes
SHA-256: `645377b1d1659dab9fc20c864a1efc432542de72808f128e469e55304faad73b`
`font_03_sfnt_off00014e19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E19	11156 bytes
SHA-256: `e177b5a278ec62bc37cb2325c2ad2122f0e2714b3effaf1892438c62151250e8`

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