PDF malware analysis — malicious · 657b120af8cbbd65

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 05:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8b705b0032df51f8a2ccd553d4f577e3 SHA-1: dda3a3cac684c7e2be9d67e1834a9fe9a39478ec SHA-256: 657b120af8cbbd65ed16c262688917ad500a8404752b3421186c1f518f8f9aaa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting its primary purpose is to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=beyond+ridiculous+meaning PDF link annotation
- http://bartuceviri.com/userfiles/file/45072120780.pdfIn PDF document text
- https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/92227611876.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610955f83c82c---milamomasetitazolofobe.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4f8e8d3e7---13183145789.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8eob32a185cj19k4u77f2qj1q3/zagaperok.pdfIn PDF document text
- http://frangarcia.eu/upload/file/31727079495.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/22504182530.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b29fe10db77fcae272a13087e75e92b5/69955569484.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/87essunh51okj73ddoasd9usj8/51792791142.pdfIn PDF document text
- http://inistor.com/ufiles/files/topodox.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa16f27645a---vobirazijovutonimivezafut.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/88218455415.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6462d569---sorijaz.pdfIn PDF document text
- http://vipforiraq.com/userfiles/files/zeparemefigav.pdfIn PDF document text
- https://ozsersogutma.com/upload/files/butigaganigikexe.pdfIn PDF document text
- http://harnettcountyhba.com/userfiles/file/72630220249.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1m8fpgcikm6hjd9t3si28ksqs7/bozokufojufobajo.pdfIn PDF document text
- https://angelsforwarriors.org/userfiles/files/42823780550.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c64a6c5e---43836448817.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ki5tksvut9m840q30s7dqp4l4l/10829044017.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e77948b0---jejewotorizidu.pdfIn PDF document text
- http://pereplanirovkaoblast.ru/pict/file/25633906510.pdfIn PDF document text
- https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5f8bbd1e75e60ddb0589c0bf9e855a4d/dukifusotaduvebemivifowa.pdfIn PDF document text
- http://qianxish.com/ckfind_image/files/gosidi.pdfIn PDF document text
- https://buyafranchise.org/files/files/tovidutugunimiw.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_off0000b609.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB609	10880 bytes
SHA-256: `2cc6b13bd3b4db1a2f3820ab0d70fe022c93b58a2283a2ae0b4c8044e88c7940`
`font_01_sfnt_off0000cef7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEF7	16624 bytes
SHA-256: `5d4036675c00e314dcfd5dd563cca158f2e18e6f20c6d431189dc6320e70353c`
`font_02_sfnt_off0000f9dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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