PDF malware analysis — malicious · a99d0e8c6f18b7de

MALICIOUS

PDF

79.4 KB Created: 2021-07-13 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 51206ae7cd747c83b090189e7226609d SHA-1: 40dc532ff9d5e1843f8c079be6f8bcef58441a58 SHA-256: a99d0e8c6f18b7dea457295ec425bd1e4283642b41ddd0271c25a93cd4c3a011

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9781

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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad00c9dd4---zamoriwepo.pdf In PDF document text
- http://eprdel.cz/userfiles/file/46856307436.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf68c80aa5---41014354311.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74f1a371c---mulerekuw.pdfIn PDF document text
- http://mnogonomerov.ru/uploads/file/lazumozusir.pdfIn PDF document text
- https://tiklatakip.com/calisma2/files/uploads/48287670482.pdfIn PDF document text
- http://khodahoanglang.com/admin/webroot/upload/image/files/vofikebubixoputil.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ln2h69b17ki9pfrpflpvvpk0m0/53768748467.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/kelimezakokotanoziwebifa.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/59821697287.pdfIn PDF document text
- http://sakem.org/userfiles/files/pipejiruwutirakapuf.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb77e64fdb---80367654951.pdfIn PDF document text
- https://syntellect.ru/Repository/file/24496376552.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/15554264691.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d88f2e8558d---lajukus.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/mafav.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/34de10c09022d4c37d046ea9b43513e2/ruwotejarudojiw.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ude11ka9o2dno0ajik60j3p63k/45387886568.pdfIn PDF document text
- http://jumpstart.mobi/ckfinder/userfiles/files/ririrutasunuwotuw.pdfIn PDF document text
- http://clubesquilacoma.com/uploads/files/zekibemudavojisugisujako.pdfIn PDF document text
- http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
- https://galerieportelouise.be/userfiles/files/3278315726.pdfIn PDF document text
- https://sailstudy.in/ckfinder/userfiles/files/negabudezi.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd31ae247---xunekiputegilufuvipomet.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3925ff74---48765254768.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/fusalevema.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=soil+science+pdf+notesPDF 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
`font_00_sfnt_off0000bea6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEA6	15996 bytes
SHA-256: `f7c46ff21d4776f05c010dbe9d1a97441c06b0afa4750f63969e47482f29b2a8`
`font_01_sfnt_off0000e7ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7ED	16836 bytes
SHA-256: `645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee`
`font_02_sfnt_off00010031.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10031	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011848.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11848	10428 bytes
SHA-256: `fc91828f798eb5bcd0331012d4e7a65fc3f7ded293ea925a6e668ac98da6097b`

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