PDF malware analysis — malicious · 47c71bec8dc1d86d

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 11:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: b0f78f14e848d3da7581538d84dc4b30 SHA-1: a5a921003dac9803c60290dc7d3eaa2c5b5f4687 SHA-256: 47c71bec8dc1d86d44b1425cff0bec4595993656326ff9996e485b894c337253

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, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts, aligning with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://luyenthitoeic.info/userfiles/file/pukojowekusipozugap.pdf In PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6cd13e0b---serupazorososutibud.pdfIn PDF document text
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/900061f2d8425d069e422ae7b3e3a359/93940078428.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/73375b347a06adb2082c7de57d7afeeb/juporaxadoribuzefu.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608661440b2ce---12953455952.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607848e1ee518---51726369791.pdfIn PDF document text
- http://www.chatanakonci.cz/userfiles/file/litimigeji.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58fae5e374---81602663879.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1da6679edbb4418bb178401bffda78b5/nipusulakularinukogut.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608944a8010cb---nirofowaw.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19f420a30b---kivimikuwoduxoguzu.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4248d1ed2---80803844850.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd751f698c3---vuwaxemozinokirubop.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bd352611---repoxosajalexizovurawe.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cdtnv3hcdvn427q4h76k31m3n7/79307204701.pdfIn PDF document text
- http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/22997589055.pdfIn PDF document text
- http://newdimension.su/userfiles/file/pawanozenikixozigej.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0eda06f9bb1a02f57267def750cebef8/41170704637.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa1412379---kowerizenuwi.pdfIn PDF document text
- http://sochistandart.com/ckfinder/userfiles/files/36433613256.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/474072364b1486fa1f7eb24c91a0e30c/45146065866.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afac773a1ed---79719997307.pdfIn PDF document text
- http://qunjl.com/userfiles/files/fexos.pdfIn PDF document text
- http://slsnn.ru/content/files/20078635790.pdfIn PDF document text
- http://cdkkck.com/uploadfile/file/20210624215031.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241282e31---nutetupodopovinilavigoro.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=truly+deeply+madly+novel+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_off0000fdac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDAC	17408 bytes
SHA-256: `a4ec8a485823672e71160dee371b8a65ce41af1d60419b206c27197c64666e92`
`font_01_sfnt_off00012ab2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AB2	10544 bytes
SHA-256: `c499289b728d6e9e2f4ad6af99f0f8a577161aeda43d888ac1a65c827077831f`
`font_02_sfnt_off000142bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142BD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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