PDF malware analysis — malicious · 822c4b3f43e4461a

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 02:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ef868f1b4beacd5c6cbc01eb1ef9fdfc SHA-1: cd1bac49fa0e3ed645871ae7894a98f405dac007 SHA-256: 822c4b3f43e4461a1cf1166233ad611a708f3b2a11016d1c0233f096ca0a3d17

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, which is a common tactic for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d6b104a6232051b6f3937cc9d83dba5d/9527396295.pdf In PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/696e5hrqfejpkc3vmqbb5q3fic/9570612254.pdfIn PDF document text
- http://elsekmont.eu/userfiles/file/gefevisupoxeradiludotemuv.pdfIn PDF document text
- https://shastriratanchatterjee.com/ckfinder/userfiles/files/39230251033.pdfIn PDF document text
- http://vina2002.com/uploads/files/79582775371.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b3abbd3c044e666c2a404b3648c8ab78/favejogira.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/25379011151.pdfIn PDF document text
- https://at-studio.tw/app/webroot/userfiles/files/20210728_000605.pdfIn PDF document text
- https://rafaela-motores.com/userfiles/file/ninuwotenobopijobafavok.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5075672b718c806ed1d50a27dcf367d0/32763265517.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8cdb7cc3b5933d9817f5c407fc77fb5e/65020847921.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d6e043fc8f4ae006c478bad1ea03b4ab/vinidelo.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/wavilutifujilew.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f9fa790d---japasadopidepu.pdfIn PDF document text
- http://fornacedelia.it/userfiles/files/4410263152.pdfIn PDF document text
- https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/rukuzesogaxunakamamefis.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/32fbfbbd0b55ad4cd3c19b0251f0fbd6/27445324967.pdfIn PDF document text
- https://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bf99fb79f7b5c413eebbd4983424bf5a/44261335014.pdfIn PDF document text
- http://koovappadyscb.com/ckfinder/userfiles/files/72687207874.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08eb987696---bobaxikibudufarozo.pdfIn PDF document text
- https://faltprasten12.se/anvandarbilder/70/files/jawakekiluriwoxuxif.pdfIn PDF document text
- https://harrisitalia.it/uploads/file/jaxovizo.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d98d760d3dd---84692568418.pdfIn PDF document text
- http://apexhealthnutrition.com/newerac2c/userfiles/file/futonalanepuwifovipagana.pdfIn PDF document text
- https://mannoorpally.com/uploads/file/dopumulalovurewogotijedaf.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=organisational+project+management+maturity+model+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_off0000decf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDECF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6E6	11332 bytes
SHA-256: `86a2770357bea89bf8cf056623a98acd3bc95c47732c5de41c0cb90bb5aee53f`
`font_02_sfnt_off00011161.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11161	17856 bytes
SHA-256: `c6c49058296452193016fcf0639a39f9e55a8953e83dfd3ce6f4f7f93a2c93a9`

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