PDF malware analysis — malicious · 5a49d8fba5b5733a

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 734256daa57de14b2f5ba838ef5c58d6 SHA-1: e823d1f291adc305c6fbb57a1b737bc0fca70bf6 SHA-256: 5a49d8fba5b5733ae260294429d3e1367b2390ca91e3de70a28ab8f103a6ca0a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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
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://whkmradio.com/userfiles/file/divunuwakidesesakurisobi.pdf In PDF document text
- http://damutech.kz/upload/2021/09files/2109030144348422973fgcr.pdfIn PDF document text
- http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/77760930002.pdfIn PDF document text
- https://swaarm.de/app/webroot/upload/files/67843012254.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366fd6eae92.pdfIn PDF document text
- https://nk-sostanj.si/files/file/91145680035.pdfIn PDF document text
- http://teraval.cz/res/file/52505855543.pdfIn PDF document text
- http://anticacarsulaeborzoi.eu/userfiles/files/636249176.pdfIn PDF document text
- https://pr-dienst.ch/file/97167552337.pdfIn PDF document text
- http://ingore.cn/upload/files/mufixasokanufipiweju.pdfIn PDF document text
- https://naves.cz/res/file/32780275438.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/8876605215.pdfIn PDF document text
- http://pogologistics.com/ckfinder/userfiles/files/xupigimavite.pdfIn PDF document text
- http://zxpgw.com/userfiles/file/98908678928.pdfIn PDF document text
- https://mpksieradz.pl/upload/file/97927936413.pdfIn PDF document text
- http://portableandcool.com/files/files/38878063843.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/20535653037.pdfIn PDF document text
- http://saigonservices.vn/images/uploads/files/75534789974.pdfIn PDF document text
- http://kenshopvn.com/uploads/files/suwovazobozezevikino.pdfIn PDF document text
- https://kokomanis.com/contents/files/7800659413.pdfIn PDF document text
- http://burningspearmarketplace.com/js/ckfinder/userfiles/files/14379777603.pdfIn PDF document text
- https://immobiliareincentro.it/allegati/file/18147218588.pdfIn PDF document text
- https://floridagreatescape.com/media/file/54368505340.pdfIn PDF document text
- http://idroter.org/userfiles/files/7317699896.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/af1c3a4248ff08b84201006fa8b78138/81627740017.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fa1aa386---91970276093.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=connectors+exercises+worksheetPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD490	16732 bytes
SHA-256: `c99f9f650177b0e25adc58c0ea0838b4c11e5445940340781660ffaf81f31381`
`font_01_sfnt_off0000ff7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF7C	10428 bytes
SHA-256: `b5a1a41b4edb257cfdb2fb3211ff85b1be945baf9e9aff597576375fcf1911f2`
`font_02_sfnt_off0001172f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1172F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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