PDF malware analysis — malicious · 4f57a5b073d2eec9

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 01:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 36453b570ff5a9c5a56a2038aa384947 SHA-1: 701b3fa7ae67187f67a76f560be8d770993c3801 SHA-256: 4f57a5b073d2eec9f0e621f6b2fef40273999abae22c5dc7cb0c68c04ecdca77

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier clean score 0.2133

Heuristics 7

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.
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://inwebjor.ru/uplcv?utm_term=ace+fishing+wild+catch+mod+apk+unlimited+money PDF link annotation
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/nugafoxuvilabuvaro.pdfIn PDF document text
- http://taxfreepoint.com/file/10557567027.pdfIn PDF document text
- https://mimpishio1.com/contents/files/35283071259.pdfIn PDF document text
- https://sportsslife.net/upload/ckfinder/files/47452080597.pdfIn PDF document text
- https://bodzlomu.com/userfiles/file/josanuri.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5c1aea670016dbd48b5fa4d670b40b51/nilebu.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/59110613749.pdfIn PDF document text
- http://hourinkan.net/js/upload/files/45149784705.pdfIn PDF document text
- http://geometrabottero.it/userfiles/files/8002878012.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe81641805---zisulerominuvarokanade.pdfIn PDF document text
- http://hockeydh.com/files/ups/files/38170039786.pdfIn PDF document text
- https://hongmao.tw/uploads/files/202109020112306145.pdfIn PDF document text
- http://itaxabc.com/userfiles/file/20210905220048_160813668.pdfIn PDF document text
- https://www.lsv-wittlage.de/ckfinder/userfiles/files/vogasojan.pdfIn PDF document text
- https://shibbirs.com/media/files/lewisunuvimuvozubozuna.pdfIn PDF document text
- https://goooinggroup.com/userfiles/files/20210905_185641.pdfIn PDF document text
- http://milkexim.ru/imgeditor/file/42138117384.pdfIn PDF document text
- https://talenthunt.biz/userfiles/file/48269246686.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/mixanumodopativakewat.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/00f5486324ba293488c3977804671a6d/dedofejazet.pdfIn PDF document text
- http://bearings-home.com/userfiles/file/sezeko.pdfIn PDF document text
- http://rcp-ranstadt.us/files/78620745265.pdfIn PDF document text
- https://alirezamirmohammadi.com/images/upload/files/80935098677.pdfIn PDF document text
- http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906121136120697.pdfIn PDF document text
- http://f-okinawa.com/img/tmp/files/21562536167.pdfIn 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_off0000e2d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2D6	18988 bytes
SHA-256: `e3a17cf6bebbc13f2827fa8e693ae5c1b1aa444246696c9e75404b0ec423c747`
`font_01_sfnt_off0001138e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1138E	11340 bytes
SHA-256: `cc4c2228c25be0a4c6bc2ab9bc438525bbb35f9d9823204fe5c5a742a290aee6`
`font_02_sfnt_off00012dfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DFA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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