PDF malware analysis — malicious · c19dcdff0c4719e4

MALICIOUS

PDF

187.1 KB Created: 2021-08-31 03:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9a60a78a02922227af0e1acd57f7e467 SHA-1: 07fef48f837d393b5fd45b2ec651e255a2e0ec51 SHA-256: c19dcdff0c4719e4509450433e61d062725e51694a5a91ca04b59437ef7bd583

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document that leverages a 'Password-protected archive lure' heuristic, indicating it's designed to trick users into believing they need a password to access an archive or attachment, which is a common tactic for delivering malware. The numerous links to potentially compromised CMS upload directories and disposable hosting suggest a distribution network for malicious content. While no scripts were directly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k2us8e94rn38esi9d3ojo2co84/93541027056.pdf In PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071f7a90d2---ribasurobov.pdfIn PDF document text
- http://condosworld.com/abisol1/userfiles/files/6473125996.pdfIn PDF document text
- http://yuanhebiotech.com/upload/files/57167350374.pdfIn PDF document text
- http://szerecsengyogyszertar.hu/editor_up/faden.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p705viduldcc5fahtoj6a2n9f6/17655917812.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/db8moq34mt1rta97hcqvu5j1h0/2205320961.pdfIn PDF document text
- http://gabortech.com/admin/file/2372488992.pdfIn PDF document text
- http://moto-bike.pl/userfiles/file/dixotejekij.pdfIn PDF document text
- http://pathtojanna.com/userfiles/files/18450824607.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3b2dd0a430a792bb99122150b390f305/poritutidibi.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/lowazipoloxigo.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b6c0015a2100d39fb1381cef670c788e/97841565705.pdfIn PDF document text
- http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/1a7ab4703de25e2d2b7198c7f5df8d4f/gusuzubiselobusidarepa.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/036fc81f055c92ff05bc263a11bb136d/41788487737.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da73bbfdd0---39971050364.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ce3ba6a9---4052972187.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d920a9cf6b491024a93a5b325b53a27a/weligudere.pdfIn PDF document text
- http://mudrberanova.cz/userfiles/file/mumewefekirojebatemakel.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4a341a231---29235077218.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d131085524---27375903766.pdfIn PDF document text
- https://mokhalasati.com/userfiles/files/nabuposadipop.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+other+psychoanalysisPDF 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_off0002739b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2739B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00028bad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x28BAD	22220 bytes
SHA-256: `cb3fd21b4e12116f00412df285b4e0a84600517d6f66c79d1dfefed6fbacca64`
`font_02_sfnt_off0002c4e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2C4E5	10548 bytes
SHA-256: `1cf4b9a8a377ac88a8d95118880abac1bfe33b150e06d5122c7733ed4b666c36`

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