PDF malware analysis — malicious · 3545e9e18fae2f86

MALICIOUS

PDF

104.0 KB Created: 2021-09-04 23:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a668ea7f60724e8ad9e58f847b6bc504 SHA-1: fc3c6566cc1d77251557ff9615bee80b16a997cc SHA-256: 3545e9e18fae2f860d2f404ad2919ad29b223c82b3ba7487d52c167f3e373d74

132 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple external URIs pointing to link farms, some hosted on compromised WordPress sites, strongly suggests a phishing or malware distribution campaign. ClamAV also detected this file as a phishing trojan.

Machine Learning

Nyx PDF Classifier clean score 0.2234

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.
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
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://casavacanzesanvito.eu/userfiles/files/gomukufodizi.pdf In PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ov20l12k455utjtuuno9kjnqd/27941072202.pdfIn PDF document text
- http://styropapex.pl/userfiles/file/85172583786.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f56399d856---sogiviwipoxeli.pdfIn PDF document text
- http://topnotchimports.com/ckfinder/userfiles/files/37214282078.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161153e35624db---kokewavefubamudunuxab.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202108/file/giwirakezulasezaxiwevoz.pdfIn PDF document text
- http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/85073505158.pdfIn PDF document text
- https://elsadaulte.com/ckfinder/userfiles/files/13516194843.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f74c8015---67560831320.pdfIn PDF document text
- https://binarbaidfabrication.com/public_html/userfiles/file/19896318237.pdfIn PDF document text
- http://srub-servis.ru/userfiles/file/28915797714.pdfIn PDF document text
- http://kd-council.com/upfile/files/jupijalobid.pdfIn PDF document text
- http://www.enredmail.com/templates/files/idCliente_/file/detivelomewurorumif.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f87521a97cc2d0310466fe9b47643d52/16155891076.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af518f641---94678409130.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210626085311133.pdfIn PDF document text
- http://tcgardening.com/userfiles/file/2021073101542873499.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7f62a3620611db938ae5b2f888301502/78950405313.pdfIn PDF document text
- https://ryokanclub.com/FileData/ckfinder/files/20210620_F4519FC6B357EAEC.pdfIn PDF document text
- https://www.sesc-am.com.br/Selecao/ckfinder/files/42524323523.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/70367498435.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2dd08471b5b8fbc1621cd59629a5283c/kakuwoniliv.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=antrenmanlarla+geometri+pdf+2019PDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00015852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15852	11116 bytes
SHA-256: `e32cdbef9d44509e162c899a1663837deac306fe20392251817112db7ea40ede`
`font_01_sfnt_off0001721f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1721F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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