PDF malware analysis — malicious · c97711d871f557f5

MALICIOUS

PDF

88.8 KB Created: 2021-08-17 17:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 97eb6303b4aa44a487735a6f29d67ce1 SHA-1: 372f09fe7d69a4547db97f65cb9ce96b3bbe0fe9 SHA-256: c97711d871f557f53a296be7aa4d61dc5bd2315faed3bfdf7ac11348c1c51412

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

Heuristics 7

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
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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1281c57ba---23248915504.pdf In PDF document text
- http://georgekoldun.com/var/upload/file/mazufo.pdfIn PDF document text
- https://netpage.info/userfiles/file/41940245483.pdfIn PDF document text
- https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/dawaravekolovib.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c720f8ba04e---62503739288.pdfIn PDF document text
- http://pattarasawat.com/ckfinder/userfiles/files/68443787781.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2cbf8cb9a---zeruxisifatukif.pdfIn PDF document text
- http://www.lebedosapartotel.com/data/yukle/files/xogabapijalas.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/18355792496.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1621277862.pdfIn PDF document text
- https://akvaguru.hu/user/file/21986395510.pdfIn PDF document text
- https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/itde47gskldj8b6n4t5792roo5/69136952029.pdfIn PDF document text
- http://jcon-aps.dk/userfiles/file/48760552280.pdfIn PDF document text
- https://x-software.cz/data/file/66091090807.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/bibixa.pdfIn PDF document text
- https://fallsplat.se/bildbank/file/matipujomekako.pdfIn PDF document text
- http://longbienco.com/js/ckfinder/userfiles/files/gefujubidizotaxoxazevik.pdfIn PDF document text
- https://kingdomofgodmn.org/userfiles/files/55254169513.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd70e4a5f---ramelugukozile.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c70586b157b---bulebitixu.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qc8bamu8qu9m4orj810sfdbrps/bijasux.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/jexovepofoxikefato.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160badb877da43---76312742907.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8180290b30fd8b6e6f22a580082022ce/zoxojuxudodowil.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d07582c83124a7fb72cc1a33fba5451b/29672118978.pdfIn PDF document text
- http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/murodi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pronomes+interrogativos+em+ingles+exercicios+com+gabaritoPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB34	16668 bytes
SHA-256: `e18b7dee24043c8611ac78261d38d7424ea8f96fec290e8ef4cd8b0bc12a34c9`
`font_01_sfnt_off0000f2da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010af1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF1	10884 bytes
SHA-256: `82c73280645074e06621dd0f2f41985970f571ad27f41748f734257f1b5fa804`
`font_03_sfnt_off0001242d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242D	18600 bytes
SHA-256: `6ab374ae5f104ebe5acc3e60af6f5f5722f766ffe852d4dd6779482b74529e08`

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