PDF malware analysis — malicious · d8068fa9e30c3e4b

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: c9f999c9ce2054940dfb5ed360b60322 SHA-1: 73416a7ffbc58590f502544ad916e5ef6695df89 SHA-256: d8068fa9e30c3e4bbcaf941e0a0ce8f31f96217666e2393f06b336a78d883071

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. Embedded JavaScript streams suggest the potential for further malicious actions, such as downloading additional payloads. The numerous external URLs, many hosted on compromised or suspicious domains, reinforce the phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

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 https://brazilairporttransfers.com/ckfinder/userfiles/files/7257026526.pdf In PDF document text
- https://djennebeads.com/nbloom/fckuploads/file/95481690848.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/73441875682.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070333bef62c---16954329773.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a045374ca78---35449915851.pdfIn PDF document text
- http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/monoge.pdfIn PDF document text
- http://diysmart.net/userfiles/file/wijiw.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b080f218e92---38223478366.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/97811969402.pdfIn PDF document text
- http://i-p-p-c.com/ckfinder/userfiles/files/19588589089.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/goxokemiwevefivagonodof.pdfIn PDF document text
- http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/98063463912.pdfIn PDF document text
- http://dishandspoonproductions.com/ckfinder/userfiles/files/rexelobubisajukane.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ba4afe352fbd098b417a7bdc9e251265/99323739896.pdfIn PDF document text
- http://berallebags.com/UploadFiles/FCKeditor/20210519185815.pdfIn PDF document text
- http://sztarmedia.hu/_user/file/57783936675.pdfIn PDF document text
- http://mirutte.com/newsfiles/files/65637361748.pdfIn PDF document text
- https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9mbidq37j2dnd1fb7hqiujfj4/15898975501.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/768323f45a892ac104f16ea86f88b124/mewizavinajex.pdfIn PDF document text
- http://tiwtactic.com/userfiles/files/sedejolatuvefufewirafid.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/94473941537.pdfIn PDF document text
- https://5703n1n6999-6a55.com/contents/files/jiwanibesenelodavinusoneb.pdfIn PDF document text
- http://sns-russia.ru/userfiles/file/49271907805.pdfIn PDF document text
- https://istanajpdua.com/contents//files/29758673962.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091891a95cd4---jewogisalotozixiguvifunus.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=omnistrip+9400+manualPDF link annotation
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/5857446416.pdfIn PDF document text
- 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_off0000ba60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA60	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d277.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD277	10656 bytes
SHA-256: `ed53dc5cf62104a4cdbabdf968b45db25e9fbb3c6c8338ce863b2a59b8e64441`
`font_02_sfnt_off0000ead7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAD7	16380 bytes
SHA-256: `d4e5de08013502e805965274b4d69c2add2a6d1812592dc611814403e57f4529`

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