PDF malware analysis — malicious · 24dcf3af0d7b2966

MALICIOUS

PDF

102.0 KB Created: 2021-06-26 04:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4c5fef100f7f4f541c4981ad36e4c84a SHA-1: 2ee03f3d1cb8a44cb454aff63705c444406a6250 SHA-256: 24dcf3af0d7b29660b83d65e169e4b8c5071e95339580dc80cd8e851343069c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised websites, indicating a likely phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9874

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://drafthe.ru/uplcv?utm_term=reproductive+system+concept+map PDF link annotation
- http://luatsutiengtrung.com/app/webroot/uploads/files/wexizajuvetojopumisu.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09a9d29135---nufetitixowabi.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/a248onvsur62nmm85g6aph0efs/serufi.pdfIn PDF document text
- http://nguyenquangcomputer.com/upload/ck/files/18619679160.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0eda7fb6---wefumisof.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2o1aceudllii963pppusk4tonb/75040969124.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/312e3659957501e71bfbd2763da22924/tasavoruruzapegewej.pdfIn PDF document text
- http://slsnn.ru/content/file/94563314420.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8bd90898---moxubiluruvuxed.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/6b15a8a268de50980e3d5149730a42dc/72774592167.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e42d653f---ronigoduzusibemoriza.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvpa70otf6864unur42l95lgf3/tunobeso.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/43102599395.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbb6696e1---mafabosikelutenamorixu.pdfIn PDF document text
- https://espiber.cl/images/uploadedimages/file/wuxenuboduvexukabenejike.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/15804c87cd685922fcca6384cd3e7f91/27369102810.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e03cceb7815ca7a84a46f42aae57c041/golisi.pdfIn PDF document text
- http://cheapmarkt.com/userfiles/file/57270167339.pdfIn PDF document text
- http://falerisztika.hu/tmp/33488266258.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r464gdb2sgg3r4vlf6bkkts035/mugarorudatowogezu.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2omdc6d26rl91pop9tj3fp6di0/nejisetavofegiwo.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c1d984e87ae1ef292e41fb5b4620a18/pufokagak.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/213e703c1c3f4a72a644186aec399a9d/kugir.pdfIn PDF document text
- http://gyobel.itpublic/file/fizemuvi.pdfIn PDF document text
- http://ucinnovation.ru/admin/ckfinder/userfiles/files/3587482349.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000112c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112C9	10956 bytes
SHA-256: `6c01cf91dd4f32ad10d9f4c9e7ab87eb11fdfff7e36b41a00e47127b0b848e74`
`font_01_sfnt_off00012c35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C35	16248 bytes
SHA-256: `6c7e1b754cf38ee70ad76cb780c90d71dc4ff6fc3e14eab78a91c98fc4406452`
`font_02_sfnt_off00014205.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14205	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015a17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15A17	18376 bytes
SHA-256: `6b55a55ad5c0148d062fa5d51622785f7a199e7fb051fd4b44dfaeb215190439`

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