PDF malware analysis — malicious · 8518232089ee9c87

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 00:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5fec31e98d2b1abf5a35d892565e77fd SHA-1: 6a973df650ab0f78e3aff4db4e4ece49ff76d437 SHA-256: 8518232089ee9c87f3b0919cec16d9f000c587fcf5162e3296fcc93b53983dc2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links implies a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=multiplying+and+factoring+polynomials+worksheet+pdf PDF link annotation
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2847e86f---napozi.pdfIn PDF document text
- https://laatuwhuisweerstralen.nl/upload/file/ritapetaroxasagu.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/79885337264.pdfIn PDF document text
- http://impactpluslearning.com/ckfinder/userfiles/files/fofatofofavafu.pdfIn PDF document text
- https://nhanloc.net/userfiles/file/82997360151.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/70078534704.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9d4ed65b3904681d4a5963a3b69d8d2e/lutowivuxoguputales.pdfIn PDF document text
- http://starcity-vinhomes.vn/app/webroot/img/files/49845878892.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/diq7p8ausbcj5escnvc9i755o3/66440845934.pdfIn PDF document text
- https://pharmnet.cz/ckfiles/files/files/74979911766.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0664a6f1---nerimolexozosurun.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130217f406e5---94918790581.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/abcb2c0aa176250ed6438a820d352e24/xudebowaronapabusofisi.pdfIn PDF document text
- http://ogledalata.bg/uploads/pages/files/wagiruduxagiziv.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be57155b50---80345851010.pdfIn PDF document text
- http://luxe-pools.fr/i/File/90232817070.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5c408b02---nikeweloxoxogowezetelet.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/pujubaretizikozilotu.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa28b4805a3---36116455189.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ai53nt9qmm6q0i8bq2no3tu6o1/84036569558.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vs757u6cc6nua9def3cpcbmq7r/73853380770.pdfIn PDF document text
- https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/46539092107.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d52971dbe54---ragedelulasawewusu.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d518ba440ea---15309834069.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6989f0c0e---lonuwu.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e540eb0d0a---kobizoxorelevobenurifojal.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_off0000c738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC738	11452 bytes
SHA-256: `6c5fa83ec7ca720f1f10758d2b61bbd817e2402ee25580272839b95577cb891a`
`font_01_sfnt_off0000e1fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1FB	16484 bytes
SHA-256: `689769da7ca8f009c54caf0abf9022c5e5849930a2520945c7f9d419c329aa2f`
`font_02_sfnt_off00010cdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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