PDF malware analysis — malicious · b51821fa3327cb39

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 20:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 972c28ead3f6f836e2b12f93e94bf4fb SHA-1: 34182350ad86a93247bd26882319db13ba54a73a SHA-256: b51821fa3327cb3930b7832325af8e9a00e9c7b2d977b721914c6d56dea0bcd1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 6

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.
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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7eaadf0e5abbfa8bc0e3dc0463e9801f/xolunigolugiwujo.pdf In PDF document text
- http://praguetransfer.com/files/file/80352451684.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/5394623061.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f70e0fe09fcc5102e0dc284b7f56ce4d/xokafozopapawozofawosaza.pdfIn PDF document text
- https://rsebolivia.org/userfiles/file/zufifakubijewuv.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/gosexunekuvumosezupe.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b931e058c---tofuguteworikoxejekuke.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608464c336533---tofuvorogojavapi.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae1325c16---zejukukotez.pdfIn PDF document text
- https://handientu.vn/userfiles/file/93148846206.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/989b24f2e577736658363903f7a24e64/43342894753.pdfIn PDF document text
- http://eiak.org/upload/editor/files/nagibelelir.pdfIn PDF document text
- http://jagodkaprzedszkole.pl/userfiles/file/zilibuwujerazaz.pdfIn PDF document text
- https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/li64q9qf802u647l129q17kn40/nupiturifunetaforunijafux.pdfIn PDF document text
- http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/vodoviwatote.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1a3317527---55243014861.pdfIn PDF document text
- http://shs1977reunion.com/clients/41590/File/46538441522.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b221cae4cd---1914508461.pdfIn PDF document text
- http://yanartextil.com/firma/files/sugosobavotejekikof.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8108751490---gosotutaxatoduji.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0624231f76---7875269094.pdfIn PDF document text
- https://amblamy.ee/upload/file/kixikimaz.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6769bf2bb7548c375d60ff5a656686f6/musupowigidivulalifitepo.pdfIn PDF document text
- http://bijverhoeven.nl/uploads/files/mumafajet.pdfIn PDF document text
- http://phone-server.com/userfiles/file/mawugilapatikusovi.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n8j9u720mlk32s8c9febu4a6n6/zizefanaxateka.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=malonic+ester+synthesis+pdfPDF 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_off0000d33e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD33E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB55	10824 bytes
SHA-256: `e92a2b213a9451cfccdc677149c12686d0eddf4cd37c864cb532c26fd2246f0b`
`font_02_sfnt_off0001044a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1044A	19352 bytes
SHA-256: `8df9093233ab14160fbf98ef5183b770811cb2825e4a5de3f4e9d72ec47647fe`

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